private static void OnParentScaleYPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
        {
            // Put some update logic here...
            ZoomElement thisLabel = (ZoomElement)source;

            if (thisLabel.ParentScaleY != 0)
            {
                double tempScale = (1.0 / thisLabel.ParentScaleY) * (thisLabel.Scale);
                thisLabel.SetScaleY(tempScale);
            }
        }
        private static void OnScaleChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
        {
            ZoomElement thisLabel = (ZoomElement)source;//get this label

            if (Math.Abs((double)e.NewValue - (double)e.OldValue) < 0.00001)
            {
                return;
            }
            if (thisLabel.ParentScaleX != 0)
            {
                double tempScaleX = (1.0 / thisLabel.ParentScaleX) * (thisLabel.Scale);
                thisLabel.SetScaleX(tempScaleX);
            }
            if (thisLabel.ParentScaleY != 0)
            {
                double tempScaleY = (1.0 / thisLabel.ParentScaleY) * (thisLabel.Scale);
                thisLabel.SetScaleY(tempScaleY);
            }
            thisLabel.ReinitializePosition(null, null);//update the label position
        }