private void ConnectButton_Click(object sender, RoutedEventArgs e)
{
if (this.DataContext == null)
{
this.DataContext = new ChatObjectModel.ObjectModel();
}
ObjectModel objModel = (ObjectModel)this.DataContext;
objModel.Connect(this.UserName.Text);
objModel.ResponseReceived += ChatReceived;
objModel.PropertyChanged += objModel_PropertyChanged;
this.ConnectButton.IsEnabled = false;
this.UserName.IsEnabled = false;
}