I am trying to create a GtkWindow that would be on top of all the windows. This includes Unity's Launcher and Panel. I am working on Kazam screen recorder and one of the options of the program is recording an arbitrary area of the screen. For this, I open a GtkWindow and let user resize it and move it around the screen to the desired location. The problem is when user wants to resize the window over the Panel (or Launcher). It can't be done. It seems that window manager is preventing this. I can move the window under panel and launcher if I ALT-drag it, but the problem because area selection window stays below Launcher and Panel. Any ideas are more than welcome.