public virtual void _ActionBar_onSideDrawerButtonClicked()
{
DrawerAnimationTimer.StartNewAnimation(DrawerAnimationTimer.GetProgress() == 0 ? AnimationDirection.In : AnimationDirection.Out);
}
void _SideDrawer_onHiddenOnStartChanged(bool newValue)
{
DrawerAnimationTimer.SetProgress(newValue ? 0 : 1);
Invalidate();
}