private void RightSliderBlock_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
 {
     if (!_rightSliderBlockCaptured)
     {
         return;
     }
     RightSliderBlock.ReleaseMouseCapture();
     _rightSliderBlockCaptured = false;
 }
 private void RightSliderBlock_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
 {
     _rightSliderBlockCaptured = RightSliderBlock.CaptureMouse();
     SetRightSlider(e.GetPosition(RightSliderBlock));
 }