diff --git a/.gitignore b/.gitignore
index f5e1d7f..b8800aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ docs/build
 *.jl.cov
 *.jl.*.cov
 *.jl.mem
+Manifest.toml
\ No newline at end of file
diff --git a/Project.toml b/Project.toml
index 1a2118e..000700c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -4,33 +4,33 @@ keywords = ["GUI"]
 license = "MIT"
 desc = "GUI programming in Julia based on CImGui.jl"
 authors = ["WooKyoung Noh <wookay.noh@gmail.com>"]
-version = "0.3.0"
+version = "0.3.1"
 
 [deps]
 CImGui = "5d785b6c-b76f-510e-a07c-3070796c7e87"
+ColorTypes = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"
 Colors = "5ae59095-9a9b-59fe-a467-6f913c188581"
+Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
+FixedPointNumbers = "53c48c17-4a7d-5ca2-90c5-79b7896eea93"
 Jive = "ba5e3d4b-8524-549f-bc71-e76ad9e9deed"
-UnicodePlots = "b8865327-cd53-5732-bb35-84acbb429228"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
-Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
-ColorTypes = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"
-FixedPointNumbers = "53c48c17-4a7d-5ca2-90c5-79b7896eea93"
-
-[extras]
-Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
-GLFW = "f7f18e0c-5ee9-5ccd-a5bf-e8befd85ed98"
-
-[targets]
-test = ["Test", "Random", "GLFW"]
+UnicodePlots = "b8865327-cd53-5732-bb35-84acbb429228"
 
 [compat]
-julia = "1"
 CImGui = "1.77"
-UnicodePlots = "1.2"
-GLFW = "3.2"
-FixedPointNumbers = "0.8"
 ColorTypes = "0.10"
 Colors = "0.12"
+FixedPointNumbers = "0.8"
+GLFW = "3.2"
 Jive = "0.2"
+UnicodePlots = "1.2"
+julia = "1"
+
+[extras]
+GLFW = "f7f18e0c-5ee9-5ccd-a5bf-e8befd85ed98"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[targets]
+test = ["Test", "Random", "GLFW"]
diff --git a/src/Desktop.jl b/src/Desktop.jl
index bdc948e..7e7e2c7 100644
--- a/src/Desktop.jl
+++ b/src/Desktop.jl
@@ -1,7 +1,7 @@
 module Desktop # Poptart
 
 export Application, Window
-export Button, InputText, Label, Slider, Checkbox
+export Button, InputText, Label, Slider, Checkbox, Popup, OpenPopup
 export Canvas
 export ScatterPlot, Spy, BarPlot, LinePlot, MultiLinePlot, Histogram
 export Separator, SameLine, NewLine, Spacing, Group
@@ -40,6 +40,7 @@ include("Desktop/imgui_controls.jl")
 include("Desktop/imgui_drawings.jl")
 include("Desktop/menus.jl")
 include("Desktop/events.jl")
+include("Desktop/popups.jl")
 
 env = Dict{Ptr{Cvoid},UIApplication}()
 include("Desktop/glfw.jl") # env exit_on_esc
diff --git a/src/Desktop/controls.jl b/src/Desktop/controls.jl
index 91c7b85..8dee56c 100644
--- a/src/Desktop/controls.jl
+++ b/src/Desktop/controls.jl
@@ -16,6 +16,7 @@ end
     title::String = "Button"
     callback::Union{Nothing,Function} = nothing
     frame::NamedTuple{(:width, :height)} = (width=0, height=0) # deprecated
+    async::Bool = false
 end
 
 """
@@ -51,4 +52,14 @@ end
     callback::Union{Nothing,Function} = nothing
 end
 
+"""
+    Popup(; label::String = "", items::Vector{<:UIControl})
+
+    !!! Note: You must use a sync Button (`Button(async=false)`) to open a Popup.
+"""
+@kwdef mutable struct Popup <: UIControl
+    label::String = ""
+    items::Vector{<:UIControl} = []
+end
+
 # module Poptart.Desktop
diff --git a/src/Desktop/imgui_controls.jl b/src/Desktop/imgui_controls.jl
index 7d73f63..08c680f 100644
--- a/src/Desktop/imgui_controls.jl
+++ b/src/Desktop/imgui_controls.jl
@@ -68,7 +68,14 @@ function imgui_control_item(imctx::Ptr, item::Slider)
 end
 
 function imgui_control_item(imctx::Ptr, item::Button)
-    CImGui.Button(item.title) && @async Mouse.leftClick(item)
+    CImGui.Button(item.title) || return
+    if item.async
+        @info "async pressed"
+        @async Mouse.leftClick(item)
+    else
+        @info "sync pressed"
+        Mouse.leftClick(item)
+    end
 end
 
 function imgui_control_item(imctx::Ptr, item::Canvas)
@@ -88,4 +95,12 @@ function imgui_control_item(imctx::Ptr, item::Checkbox)
     end
 end
 
+# Popup
+function imgui_control_item(imctx::Ptr, item::Popup)
+    if CImGui.BeginPopup(item.label)
+        imgui_control_item.(Ref(imctx), item.items)
+        CImGui.EndPopup()
+    end
+end
+
 # module Poptart.Desktop
diff --git a/src/Desktop/popups.jl b/src/Desktop/popups.jl
new file mode 100644
index 0000000..408c467
--- /dev/null
+++ b/src/Desktop/popups.jl
@@ -0,0 +1,7 @@
+# module Poptart.Desktop
+
+function OpenPopup(popup::Popup)
+    CImGui.OpenPopup(popup.label)
+end
+
+# module Poptart.Desktop
\ No newline at end of file
diff --git a/test/poptart/desktop/controls.jl b/test/poptart/desktop/controls.jl
index 72dc2c5..3458345 100644
--- a/test/poptart/desktop/controls.jl
+++ b/test/poptart/desktop/controls.jl
@@ -26,6 +26,14 @@ check1 = Checkbox(label="check1", value=true)
 check2 = Checkbox(label="check2", value=false)
 push!(window1.items, check1, check2)
 
+popup_button = Button(title="Open Popup", async=false)
+popup1 = Popup(label="popup1", items = [Label("A popup")])
+push!(window1.items, popup1)
+
+didClick(popup_button) do event
+    OpenPopup(popup1)
+end
+
 pause(app)
 
 end # module test_poptart_desktop_controls