private static void OnPaste(object sender, ExecutedRoutedEventArgs e)
		{
			RichTextBox richTextBox = sender as RichTextBox;
			if (richTextBox == null) { return; }

			var dataObj = (IDataObject)Clipboard.GetDataObject();
			if (dataObj == null) { return; }

			if (Clipboard.ContainsText(TextDataFormat.Rtf))
			{
				string rtfText = Clipboard.GetText(TextDataFormat.Rtf);
				TextSelection ts = richTextBox.Selection;
				TextRange textRange = new TextRange(richTextBox.Selection.Start, richTextBox.Selection.End);
				if (textRange.CanLoad(DataFormats.Rtf))
				{
					textRange.Load(new MemoryStream(_encoding.GetBytes(rtfText)), DataFormats.Rtf);
					SetDefaultFontColor(textRange);
				}
			}

			e.Handled = true;
		}