/// <summary>
/// Show the watermark on the specified control
/// </summary>
/// <param name="control">Control to show the watermark on</param>
private static void ShowWatermark(Control control)
{
// Remove the old watermark.
control.TryRemoveAdorners <WatermarkAdorner>();
// Add the new watermark.
FrameworkElement content = GetContent(control);
control.TryAddAdorner <WatermarkAdorner>(new WatermarkAdorner(control, content));
}