CComponentsHeader: add methode initRepaintSlot() and considered parent

Required in sub classes. Considering of parent ensures usage of
required background color in sub classes.

src/gui/components/cc_frm_header.h

@@ -112,6 +112,8 @@ class CComponentsHeader : public CComponentsForm, public CCTextScreen
 		void initButtons();
 		///sub: init clock object
 		void initClock();
+		///int repaint slot
+		void initRepaintSlot();
 
 	public:
 		enum