Xceed.Wpf.Toolkit.RangeSlider.LowerRange_Click C# (CSharp) Method

      private void LowerRange_Click(object sender, RoutedEventArgs e)
      {
        CoercedValues cv = this.GetCoercedValues();
        //When Maximum is not greater than Minimum, the
        //slider display is in an inconsistant state. Don't 
        //consider any operation from the user
        if( cv.Minimum < cv.Maximum )
        {
          double newValue = cv.LowerValue - this.Step;
          this.LowerValue = Math.Min( cv.Maximum, Math.Max( cv.Minimum, newValue ) );
        }
      }