private void RadRichTextEditor1_CommandExecuted(object sender, CommandExecutedEventArgs e)
 {
     if (e.Command is ToggleUnderlineCommand || e.Command is ChangeFontForeColorCommand)
     {
         SyncUnderlineColorForSelection();
     }
 }
 private void SyncUnderlineColorForSelection()
 {
     RadDocument document = this.radRichTextEditor1.Document;
     if (document == null)
         return;

     foreach (Span span in document.EnumerateChildrenOfType<Span>())
     {
         if (span.Underline)
         {
             span.UnderlineColor = span.ForeColor;
         }
     }
 }