diff --git a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ColorPickerStyle.xaml b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ColorPickerStyle.xaml
index 1a38ecfa..342a8a41 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ColorPickerStyle.xaml
+++ b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ColorPickerStyle.xaml
@@ -49,6 +49,8 @@
                 Value="Center" />
         <Setter Property="FontFamily"
                 Value="/Panuon.WPF.UI;component/Resources/Fonts/#PanuonIcon" />
+        <Setter Property="FontSize"
+                Value="{Binding Path=(local:IconHelper.ToggleArrowFontSize), RelativeSource={RelativeSource AncestorType=ComboBox}, Mode=OneWay}" />
         <Setter Property="Content"
                 Value="&#xe903;" />
         <Setter Property="Padding"
@@ -88,6 +90,8 @@
                 Value="{Binding IconFontFamily, Source={x:Static local:GlobalSettings.Setting}}" />
         <Setter Property="local:IconHelper.FontSize"
                 Value="{Binding IconFontSize, Source={x:Static local:GlobalSettings.Setting}}" />
+        <Setter Property="local:IconHelper.ToggleArrowFontSize"
+                Value="{Binding FontSize, RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Foreground"
                 Value="{Binding Path=(i:VisualStateHelper.Foreground), RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Margin"
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ComboBoxStyle.xaml b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ComboBoxStyle.xaml
index b568979d..05dc6d0e 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ComboBoxStyle.xaml
+++ b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ComboBoxStyle.xaml
@@ -66,6 +66,8 @@
                 Value="Center" />
         <Setter Property="FontFamily"
                 Value="/Panuon.WPF.UI;component/Resources/Fonts/#PanuonIcon" />
+        <Setter Property="FontSize"
+                Value="{Binding Path=(local:IconHelper.ToggleArrowFontSize), RelativeSource={RelativeSource AncestorType=ComboBox}, Mode=OneWay}" />
         <Setter Property="Content"
                 Value="&#xe903;" />
         <Setter Property="Padding"
@@ -116,6 +118,8 @@
                 Value="{Binding IconFontFamily, Source={x:Static local:GlobalSettings.Setting}}" />
         <Setter Property="local:IconHelper.FontSize"
                 Value="{Binding IconFontSize, Source={x:Static local:GlobalSettings.Setting}}" />
+        <Setter Property="local:IconHelper.ToggleArrowFontSize"
+                Value="{Binding FontSize, RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Foreground"
                 Value="{Binding Path=(i:VisualStateHelper.Foreground), RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Margin"
@@ -260,5 +264,5 @@
             </MultiDataTrigger>
         </Style.Triggers>
     </Style>
-
+    
 </ResourceDictionary>
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/DateTimePickerStyle.xaml b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/DateTimePickerStyle.xaml
index 8b54dd6d..79f831cf 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/DateTimePickerStyle.xaml
+++ b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/DateTimePickerStyle.xaml
@@ -41,6 +41,8 @@
                 Value="Center" />
         <Setter Property="FontFamily"
                 Value="/Panuon.WPF.UI;component/Resources/Fonts/#PanuonIcon" />
+        <Setter Property="FontSize"
+                Value="{Binding Path=(local:IconHelper.ToggleArrowFontSize), RelativeSource={RelativeSource AncestorType=ComboBox}, Mode=OneWay}" />
         <Setter Property="Content"
                 Value="&#xe903;" />
         <Setter Property="Padding"
@@ -168,6 +170,8 @@
                 Value="{Binding IconFontFamily, Source={x:Static local:GlobalSettings.Setting}}" />
         <Setter Property="local:IconHelper.FontSize"
                 Value="{Binding IconFontSize, Source={x:Static local:GlobalSettings.Setting}}" />
+        <Setter Property="local:IconHelper.ToggleArrowFontSize"
+                Value="{Binding FontSize, RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Foreground"
                 Value="{Binding Path=(i:VisualStateHelper.Foreground), RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Margin"
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ExpanderStyle.xaml b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ExpanderStyle.xaml
index 5fa9dd6e..a4f52f4a 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ExpanderStyle.xaml
+++ b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/ExpanderStyle.xaml
@@ -18,6 +18,8 @@
                 Value="Center" />
         <Setter Property="FontFamily"
                 Value="/Panuon.WPF.UI;component/Resources/Fonts/#PanuonIcon" />
+        <Setter Property="FontSize"
+                Value="{Binding Path=(local:IconHelper.ToggleArrowFontSize), RelativeSource={RelativeSource AncestorType=ComboBox}, Mode=OneWay}" />
         <Setter Property="Content"
                 Value="&#xe903;" />
         <Setter Property="Foreground"
@@ -102,6 +104,8 @@
                 Value="{Binding IconFontFamily, Source={x:Static local:GlobalSettings.Setting}}" />
         <Setter Property="local:IconHelper.FontSize"
                 Value="{Binding IconFontSize, Source={x:Static local:GlobalSettings.Setting}}" />
+        <Setter Property="local:IconHelper.ToggleArrowFontSize"
+                Value="{Binding FontSize, RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="FocusVisualStyle"
                 Value="{Binding FocusVisualStyle, Source={x:Static local:GlobalSettings.Setting}}" />
         <Setter Property="local:ExpanderHelper.HeaderSeparatorBrush"
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/MultiComboBoxStyle.xaml b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/MultiComboBoxStyle.xaml
index 7f19bc86..d7c749b4 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/MultiComboBoxStyle.xaml
+++ b/SourceCode/SharedResources/Panuon.WPF.UI.Internal/Styles/MultiComboBoxStyle.xaml
@@ -77,6 +77,8 @@
                 Value="Center" />
         <Setter Property="FontFamily"
                 Value="/Panuon.WPF.UI;component/Resources/Fonts/#PanuonIcon" />
+        <Setter Property="FontSize"
+                Value="{Binding Path=(local:IconHelper.ToggleArrowFontSize), RelativeSource={RelativeSource AncestorType=ComboBox}, Mode=OneWay}" />
         <Setter Property="Content"
                 Value="&#xe903;" />
         <Setter Property="Padding"
@@ -119,6 +121,8 @@
                 Value="{Binding IconFontFamily, Source={x:Static local:GlobalSettings.Setting}}" />
         <Setter Property="local:IconHelper.FontSize"
                 Value="{Binding IconFontSize, Source={x:Static local:GlobalSettings.Setting}}" />
+        <Setter Property="local:IconHelper.ToggleArrowFontSize"
+                Value="{Binding FontSize, RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Foreground"
                 Value="{Binding Path=(i:VisualStateHelper.Foreground), RelativeSource={RelativeSource Self}, Mode=OneWay}" />
         <Setter Property="local:IconHelper.Margin"
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI/Controls/CalendarXItem.cs b/SourceCode/SharedResources/Panuon.WPF.UI/Controls/CalendarXItem.cs
index 0c8545dd..50fa14b6 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI/Controls/CalendarXItem.cs
+++ b/SourceCode/SharedResources/Panuon.WPF.UI/Controls/CalendarXItem.cs
@@ -279,10 +279,10 @@ public DataTemplate SpecialDayHighlightTemplate
         #endregion
 
         #region Overrides
-        protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
+        protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
         {
             e.Handled = true;
-            base.OnPreviewMouseDown(e);
+            base.OnPreviewMouseLeftButtonDown(e);
             if (CanSelect)
             {
                 RaiseEvent(new RoutedEventArgs(SelectedEvent));
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorPicker.cs b/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorPicker.cs
index e01f59d7..caf4a659 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorPicker.cs
+++ b/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorPicker.cs
@@ -549,6 +549,10 @@ private static void OnMouseButtonDown(object sender, MouseButtonEventArgs e)
 
         private static void OnPreviewMouseButtonDown(object sender, MouseButtonEventArgs e)
         {
+            if(e.LeftButton != MouseButtonState.Pressed)
+            {
+                return;
+            }
             var colorPicker = (ColorPicker)sender;
             if (colorPicker.IsEditable)
             {
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorSelector.cs b/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorSelector.cs
index 0da673d4..90954575 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorSelector.cs
+++ b/SourceCode/SharedResources/Panuon.WPF.UI/Controls/ColorSelector.cs
@@ -277,8 +277,8 @@ public override void OnApplyTemplate()
             _thumbFence.ThumbPositionChanged += ThumbFence_PositionChanged;
 
             _dropperThumb = GetTemplateChild(DropperThumbTemplateName) as Thumb;
-            _dropperThumb.PreviewMouseDown += DropperThumb_PreviewMouseDown;
-            _dropperThumb.PreviewMouseUp += DropperThumb_PreviewMouseUp;
+            _dropperThumb.PreviewMouseLeftButtonDown += DropperThumb_PreviewMouseLeftButtonDown;
+            _dropperThumb.PreviewMouseLeftButtonUp += DropperThumb_PreviewMouseLeftButtonUp;
             _dropperThumb.DragDelta += DropperThumb_DragDelta;
             _dropperThumb.DragStarted += DropperThumb_DragStarted;
             _dropperThumb.DragCompleted += _dropperThumb_DragCompleted;
@@ -313,12 +313,12 @@ private void _dropperThumb_DragCompleted(object sender, DragCompletedEventArgs e
             Cursor = Cursors.Arrow;
         }
 
-        private void DropperThumb_PreviewMouseDown(object sender, MouseButtonEventArgs e)
+        private void DropperThumb_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
         {
             Cursor = CursorUtil.DropperCursor;
         }
 
-        private void DropperThumb_PreviewMouseUp(object sender, MouseButtonEventArgs e)
+        private void DropperThumb_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
         {
             Cursor = Cursors.Arrow;
         }
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/IconHelper.cs b/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/IconHelper.cs
index 2f09acf7..c7b63a07 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/IconHelper.cs
+++ b/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/IconHelper.cs
@@ -157,6 +157,21 @@ public static void SetFontSize(DependencyObject obj, double value)
             DependencyProperty.RegisterAttached("FontSize", typeof(double), typeof(IconHelper), new PropertyMetadata(12.0));
         #endregion
 
+        #region ToggleArrowFontSize
+        public static double GetToggleArrowFontSize(DependencyObject obj)
+        {
+            return (double)obj.GetValue(ToggleArrowFontSizeProperty);
+        }
+
+        public static void SetToggleArrowFontSize(DependencyObject obj, double value)
+        {
+            obj.SetValue(ToggleArrowFontSizeProperty, value);
+        }
+
+        public static readonly DependencyProperty ToggleArrowFontSizeProperty =
+            DependencyProperty.RegisterAttached("ToggleArrowFontSize", typeof(double), typeof(IconHelper), new PropertyMetadata(12.0));
+        #endregion
+
         #region FontFamily
         public static FontFamily GetFontFamily(DependencyObject obj)
         {
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ListBoxItemHelper.cs b/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ListBoxItemHelper.cs
index b0c586aa..a95c0539 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ListBoxItemHelper.cs
+++ b/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ListBoxItemHelper.cs
@@ -384,7 +384,7 @@ internal static void SetRegist(ListBoxItem listBoxItem, bool value)
         private static void OnRegistChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
         {
             var listBoxItem = d as ListBoxItem;
-            listBoxItem.PreviewMouseDown += ListBoxItem_PreviewMouseDown;
+            listBoxItem.PreviewMouseLeftButtonDown += ListBoxItem_PreviewMouseDown;
         }
 
         private static void ListBoxItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ScrollViewerHelper.cs b/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ScrollViewerHelper.cs
index 1f2d6f97..a292bc77 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ScrollViewerHelper.cs
+++ b/SourceCode/SharedResources/Panuon.WPF.UI/Helpers/ScrollViewerHelper.cs
@@ -103,18 +103,33 @@ public static void SetAnimationDuration(DependencyObject obj, TimeSpan value)
         #endregion
 
         #region MouseWheelDelta
-        public static double GetMouseWheelDelta(DependencyObject obj)
+        public static double? GetMouseWheelDelta(DependencyObject obj)
         {
             return (double)obj.GetValue(MouseWheelDeltaProperty);
         }
 
-        public static void SetMouseWheelDelta(DependencyObject obj, double value)
+        public static void SetMouseWheelDelta(DependencyObject obj, double? value)
         {
             obj.SetValue(MouseWheelDeltaProperty, value);
         }
 
         public static readonly DependencyProperty MouseWheelDeltaProperty =
-            DependencyProperty.RegisterAttached("MouseWheelDelta", typeof(double), typeof(ScrollViewerHelper), new FrameworkPropertyMetadata(48d, FrameworkPropertyMetadataOptions.Inherits));
+            DependencyProperty.RegisterAttached("MouseWheelDelta", typeof(double?), typeof(ScrollViewerHelper), new FrameworkPropertyMetadata(48d, FrameworkPropertyMetadataOptions.Inherits));
+        #endregion
+
+        #region MouseWheelUnit
+        public static int GetMouseWheelUnit(DependencyObject obj)
+        {
+            return (int)obj.GetValue(MouseWheelUnitProperty);
+        }
+
+        public static void SetMouseWheelUnit(DependencyObject obj, int value)
+        {
+            obj.SetValue(MouseWheelUnitProperty, value);
+        }
+
+        public static readonly DependencyProperty MouseWheelUnitProperty =
+            DependencyProperty.RegisterAttached("MouseWheelUnit", typeof(int), typeof(ScrollViewerHelper), new FrameworkPropertyMetadata(1, FrameworkPropertyMetadataOptions.Inherits));
         #endregion
 
         #region VerticalOffset
@@ -341,17 +356,28 @@ private static void ScrollViewer_PreviewMouseWheel(object sender, MouseWheelEven
                     }
                 }
 
-                var mouseWheelDelta = GetMouseWheelDelta(scrollViewer);
-                if (scrollViewer.CanContentScroll) 
+                var mouseWheelDelta = 48d;
+                if (scrollViewer.CanContentScroll)
                 {
-                    if (scrollViewer.ViewportHeight != scrollViewer.ActualHeight) //Excluding WrapPanel
+                    if (GetMouseWheelUnit(scrollViewer) is int unit)
+                    {
+                        mouseWheelDelta = unit;
+                    }
+                    else
                     {
-                        mouseWheelDelta = 3;
+                        mouseWheelDelta = 1;
                     }
                 }
-                else if (scrollViewer.ViewportHeight != scrollViewer.ActualHeight)
+                else
                 {
-                    mouseWheelDelta = scrollViewer.ViewportHeight;
+                    if (GetMouseWheelDelta(scrollViewer) is double delta)
+                    {
+                        mouseWheelDelta = delta;
+                    }
+                    else if (scrollViewer.ViewportHeight != scrollViewer.ActualHeight)
+                    {
+                        mouseWheelDelta = scrollViewer.ViewportHeight;
+                    }
                 }
 
                 switch (GetWheelScrollingDirection(scrollViewer))
diff --git a/SourceCode/SharedResources/Panuon.WPF.UI/Properties/AssemblyInfo.cs b/SourceCode/SharedResources/Panuon.WPF.UI/Properties/AssemblyInfo.cs
index a1bd57cc..a96b9dd4 100644
--- a/SourceCode/SharedResources/Panuon.WPF.UI/Properties/AssemblyInfo.cs
+++ b/SourceCode/SharedResources/Panuon.WPF.UI/Properties/AssemblyInfo.cs
@@ -25,5 +25,5 @@
     ResourceDictionaryLocation.SourceAssembly
 )]
 
-[assembly: AssemblyVersion("1.2.1.2")]
-[assembly: AssemblyFileVersion("1.2.1.2")]
\ No newline at end of file
+[assembly: AssemblyVersion("1.2.1.3")]
+[assembly: AssemblyFileVersion("1.2.1.3")]
\ No newline at end of file