public virtual void onMouseWheel(object sender, MouseWheelEventArgs e){
GraphicObject p = Parent as GraphicObject;
if (p != null)
p.onMouseWheel(sender,e);
MouseWheelChanged.Raise (this, e);
}
void Mouse_WheelChanged(object sender, MouseWheelEventArgs e)
{
if (_hoverWidget == null)
{
MouseWheelChanged.Raise(this, e);
return;
}
_hoverWidget.onMouseWheel(this, e);
}
