Merge pull request #9016 from Popov72/gui-selectionpanel-expose-panel

GUI: Give access to the internal stack panel of SelectionPanel

gui/src/2D/controls/selector.ts

@@ -325,6 +325,11 @@ export class SelectionPanel extends Rectangle {
         return "SelectionPanel";
     }
 
+    /** Gets the (stack) panel of the SelectionPanel  */
+    public get panel(): StackPanel {
+        return this._panel;
+    }
+
     /** Gets or sets the headerColor */
     public get headerColor(): string {
         return this._headerColor;