Control Width/Height return 0 during Window.Opening before layout

Controls created and added during Window.Opening() can report Width = 0 and Height = 0 when read immediately, even though the control has documented default dimensions. For example, New Button should create an 80x30 button, but Print(c0.Width, c0.Height) in the window Opening() event prints 0 0. The same read works later in Opened(), after layout has run.