private void Super_MouseUp(object sender, MouseButtonEventArgs e)
 {
     if (dragServo != null)
     {
         dragServo.SetValue(Panel.ZIndexProperty, 0);
         dragServo = null;
         Mouse.Capture(null);
     }
 }
        private void Servo_MouseDownEventHandler(object sender, EventArgs e)
        {
            UcServoMain    s  = (UcServoMain)sender;
            MouseEventArgs me = (MouseEventArgs)e;

            if (me.LeftButton == MouseButtonState.Pressed)
            {
                s.pObject = me.GetPosition(s);
                s.SetValue(Panel.ZIndexProperty, 999);
                dragServo = s;
                Mouse.Capture(gridPanel);
            }
        }