making the wheel scroll a widget

how can i scroll a widget when the mouse wheel is moved?
i added an event handler to a panel scollable that trace the EVENT_MOUSE_WHEEL.

what code must i put in my function to avoid the scrollbar to scroll when the mouse wheel is moved?

now i have this code, but i am blocked...



void wheelScrolling(const QuickGUI::EventArgs &args)
{
QuickGUI::MouseEventArgs mea = dynamic_cast<const QuickGUI::MouseEventArgs&>(args);

float wheelChange = mea.wheelChange;

QuickGUI::Panel *mPanel = dynamic_cast<QuickGUI::Panel*>(mea.widget);

// ???

}