private void MenuItem_KolorTła_Click(object sender, RoutedEventArgs e)
{
Color kolorTła = Colors.White;
if (textBox.Background is SolidColorBrush)
{
kolorTła = (textBox.Background as SolidColorBrush).Color;
}
if (WindowsFormsHelper.ChooseColor(ref kolorTła))
{
textBox.Background = new SolidColorBrush(kolorTła);
}
}