How to make toolbar without GTK_CAN_FOCUS

["Miroslav Rajcic" <rajcic sokrates hr>]

I am trying to make my toolbar (with tool buttons) not to receive focus when
Tab is used to move focus along the window widgets.

I've tried to call
GTK_WIDGET_UNSET_FLAGS(widget, GTK_CAN_FOCUS);
to both toolbar widget and every single tool button, but it doesn't seem to
work.
Toolbar still gets focused when Tab key is used to change focus.

Anyone has a clue?

TIA,
  Miroslav Rajcic