void OnDoubleClick(User user)
{
ChatWindow window = null;
if (MainWindow.chatWindowMap.ContainsKey(user.Username) == true)
{
window = MainWindow.chatWindowMap[user.Username] as ChatWindow;
}
else
{
window = new Windows.ChatWindow();
MainWindow.chatWindowMap[user.Username] = window;
window.SetUser(user);
}
window.Show();
}
