From Xojo Documentation


Window.ShowWithin(parentWindow as Window[,facing as Integer])

Supported for all project types and targets.

Displays the window within the parentWindow. If the window is a Document window, it is displayed in a modeless state and is equivalent to Show.


Used to display Sheet and Drawer windows on macOS within a specific parent. For sheet windows, it is displayed in a modal state. For a Drawer window they are displayed in a modeless state. The optional facing parameter pertains to Drawer windows and indicates which side the drawer pops out of the side shown in the table below:

Value Description
-1 Default (determined by the system -- usually left),
0 Top
1 Bottom
2 Right
3 Left (same ordering as tab panels).

If you omit facing, the default value will be used.