gtkD has a ColorSelectionDialog class with a method that returns an associated ColorSelection class as a Widget. In COMPO I used to cast this to a ColorSelection, then I could set the initial color and retrieve the user's choice.
The inheritance sequence is: Widget -> Container -> Box -> VBox -> ColorSelection OrientableIF -> that is, Box is derived from Container and OrientableIF. I've tried a chain of casts, but just the first one Widget w = dialog.getColorSelection(); gtk.Container.Container ctr = cast(gtk.Container.Container) w; gets null. There's a Container class in the application also, but I have qualified all references to Container in the module. Is there a way to force the older cast behavior? Steve