RectControl.Parent
From Xojo Documentation
Property (As Control )
aRectControl.Parent = newControlValue
or
ControlValue = aRectControl.Parent
Supported for all project types and targets.
or
ControlValue = aRectControl.Parent
Supported for all project types and targets.
Used to get and set the control’s parent control or window.
Notes
Returns Nil if the parent is the window. Assign Nil to make the control's parent the window, even if it is enclosed by another control. The child control's behavior in the IDE will reflect the parent's state. If the parent control is somehow in another window, an InvalidParentException will occur.
Example
The following example sets the parent of the control to the window.