LayoutManager VerticalLayout HorizontalLayout TileLayoutevents: draw() - caller on_draw() - core handler, for overloading connect('draw', my_draw) - additional handlerFocus----- * only one node in hierarchy can have focus * all parent containers have focus, so they can relay events to child * top container has always focus * grab_focus() on any node will clean old focus and set focus to this child * global shortcuts can be handled in keypress handler of top widget