Window.ImplicitInstance
From Xojo Documentation
Design Property (as Boolean)
If True, an instance of the window can be instantiated implicitly. Set ImplicitInstance in the Properties pane in the IDE.
Notes
For example, an implicit instance is instantiated by referring to one of its properties or by calling its Show method. That is, a statement such as:
Window2.Show
or
Window2.ShowModal
will instantiate the window only if ImplicitInstance is True. The default is True. If False, you need to instantiate it explicitly via the New operator. That is, only a statement such as:
w = New Window2
will instantiate the window.
If ImplicitInstance is False, statements such as:
Window2.Show
and references to any window or control properties will produce an error.