private void RadMode_Checked(object sender, RoutedEventArgs e)
{
/// Sets the editing mode to Ink or Select.
if (radSelectMode.IsChecked.Value == true)
drawingPane.EditingMode = InkCanvasEditingMode.Select;
//else if (radDrawingMode.IsChecked.Value == true)
// drawingPane.EditingMode = InkCanvasEditingMode.Ink;
else if (radEraseMode.IsChecked.Value == true)
drawingPane.EditingMode = InkCanvasEditingMode.EraseByPoint;
}