private void SendBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
SendBox.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
if (e.Key == Key.RightCtrl)
{
SendBox.Text += "\r\n";
SendBox.SelectionStart = SendBox.Text.Length;
}
}
