diff --git a/src/app/showcase/doc/treetable/editdoc.ts b/src/app/showcase/doc/treetable/editdoc.ts
index 91b5817790e..6291821360b 100644
--- a/src/app/showcase/doc/treetable/editdoc.ts
+++ b/src/app/showcase/doc/treetable/editdoc.ts
@@ -25,7 +25,7 @@ interface Column {
                 </ng-template>
                 <ng-template pTemplate="body" let-rowNode let-rowData="rowData" let-columns="columns">
                     <tr>
-                        <td *ngFor="let col of columns; let i = index" ttEditableColumn [ngClass]="{ 'p-toggler-column': i === 0 }">
+                        <td *ngFor="let col of columns; let i = index" ttEditableColumn [ttEditableColumnDisabled]="i == 0" [ngClass]="{ 'p-toggler-column': i === 0 }">
                             <p-treeTableToggler [rowNode]="rowNode" *ngIf="i === 0"></p-treeTableToggler>
                             <p-treeTableCellEditor>
                                 <ng-template pTemplate="input">
@@ -73,7 +73,7 @@ export class EditDoc implements OnInit {
     </ng-template>
     <ng-template pTemplate="body" let-rowNode let-rowData="rowData" let-columns="columns">
         <tr>
-            <td *ngFor="let col of columns; let i = index" ttEditableColumn [ngClass]="{ 'p-toggler-column': i === 0 }">
+            <td *ngFor="let col of columns; let i = index" ttEditableColumn [ttEditableColumnDisabled]="i == 0" [ngClass]="{ 'p-toggler-column': i === 0 }">
                 <p-treeTableToggler [rowNode]="rowNode" *ngIf="i === 0"></p-treeTableToggler>
                 <p-treeTableCellEditor>
                     <ng-template pTemplate="input">
@@ -98,7 +98,7 @@ export class EditDoc implements OnInit {
         </ng-template>
         <ng-template pTemplate="body" let-rowNode let-rowData="rowData" let-columns="columns">
             <tr>
-                <td *ngFor="let col of columns; let i = index" ttEditableColumn [ngClass]="{ 'p-toggler-column': i === 0 }">
+                <td *ngFor="let col of columns; let i = index" ttEditableColumn [ttEditableColumnDisabled]="i == 0" [ngClass]="{ 'p-toggler-column': i === 0 }">
                     <p-treeTableToggler [rowNode]="rowNode" *ngIf="i === 0"></p-treeTableToggler>
                     <p-treeTableCellEditor>
                         <ng-template pTemplate="input">