Called when focus is lost because another Element was clicked. This widget then loose the "focus" (ie. keyboard focus). This function is meant to be overriden.
if a widget is foldable (like a popup menu), you can us this callback to close it once the user click anywhere else.
See Implementation
Called when focus is lost because another Element was clicked. This widget then loose the "focus" (ie. keyboard focus). This function is meant to be overriden.