static QWidget * compositionController(const QList< IVP1System * > &systemsWithControllersAllowed, QMap< IVP1System *, QWidget * > &sys2tabpage, VP1TabWidget *&tabwidget, const QList< QPair< IVP1System *, bool > > &system2switchable, QMap< QCheckBox *, IVP1System * > &checkbox2system, VP1ColorSelectButton *&colorselectbutton, QWidget *extrawidget=0, bool nobgdcolorsel=false)