From Xojo Documentation

Read-Only Property (As Window )
WindowValue = aRectControl.TrueWindow

New in 2009r1

Supported for all project types and targets.

Returns a reference to the actual enclosing Window.


TrueWindow walks up the window hierarchy and finds the actual enclosing window regardless of how deeply nested the RectControl or ContainerControl hierarchy is.

Window also has a TrueWindow property.


This example accesses the TrueWindow and displays its Title property in a TextField.

TextField1.Value = Me.TrueWindow.Title