Pressing Enter on TextBox in Silverlight

private void MyTextBox_KeyUp(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter) SomeButton_Click(this, null);

    }

    private void SomeButton_Click(object sender, RoutedEventArgs e)
    {
        ICommand cmd = SomeButton.Command;
        if (cmd.CanExecute(null))
        {
            cmd.Execute(null);
        }
    }