A feature request to add Window.TEXTURED_BACKGROUND style for Window objects. This style must be translated to NSTexturedBackgroundWindowMask on the Mac, thus allowing apps to create toolbars similar to native apps on the Mac.

Windows Vista and higher also provide some sort of support for extending the window decorations into the interior of the frame. We may want to investigate this and implement the support for this feature on Windows later, as a lower priority task, too.

X11/GTK don't seem to be able to support this feature by design.