public void Clear()
{
foreach (Panel p in RootGrid.Children)
{
p.Children.Clear();
}
if (Manipulator != null)
{
Manipulator.Dispose();
}
SelectionActions.Hide();
SelectionPolygon.Visibility = Visibility.Collapsed;
LeftSelectionItem.Visibility = Visibility.Collapsed;
RightSelectionItem.Visibility = Visibility.Collapsed;
}