private void btnChannelGroup_Click(object sender, RoutedEventArgs e)
        {
            channelGroup = txtChannelGroup.Text;

            this.IsEnabled = false;
            Border border = new Border();
            border.BorderBrush = new SolidColorBrush(Colors.Black);
            border.BorderThickness = new Thickness(5.0);

            StackPanel channelGroupStackPanel = new StackPanel();
            channelGroupStackPanel.Background = new SolidColorBrush(Colors.Blue);
            channelGroupStackPanel.Width = 400;
            channelGroupStackPanel.Height = 600;

            Popup channelGroupPopup = new Popup();
            channelGroupPopup.Height = 300;
            channelGroupPopup.Width = 300;

            channelGroupPopup.HorizontalOffset = 10;
            channelGroupPopup.VerticalOffset = 100;

            ChannelGroupUserControl control = new ChannelGroupUserControl();

            TextBox txtPAMChannelGroup = control.FindName("txtChannelGroup") as TextBox;
            if (txtPAMChannelGroup != null)
            {
                txtPAMChannelGroup.Text = channelGroup;
            }
            TextBox txtChannelName = control.FindName("txtChannelName") as TextBox;
            if (txtChannelName != null)
            {
                txtChannelName.Text = "ch1";
            }

            channelGroupStackPanel.Children.Add(control);
            border.Child = channelGroupStackPanel;

            channelGroupPopup.Child = border;
            channelGroupPopup.IsOpen = true;

            channelGroupPopup.Closed += (senderPopup, argsPopup) =>
            {
                if (control.IsOKButtonEntered)
                {
                    string userChannelGroup = "";
                    string userChannelName = "";
                    
                    txtPAMChannelGroup = control.FindName("txtChannelGroup") as TextBox;
                    if (txtPAMChannelGroup != null)
                    {
                        userChannelGroup = txtPAMChannelGroup.Text;

                        txtChannelName = control.FindName("txtChannelName") as TextBox;
                        if (txtChannelName != null)
                        {
                            userChannelName = txtChannelName.Text;
                        }

                        RadioButton radGetChannelsOfChannelGroup = control.FindName("radGetChannelsOfChannelGroup") as RadioButton;
                        if (radGetChannelsOfChannelGroup != null && radGetChannelsOfChannelGroup.IsChecked.Value)
                        {
                            DisplayMessageInTextBox("Running GetChannelsForChannelGroup:");
                            pubnub.GetChannelsForChannelGroup<string>(userChannelGroup, PubnubCallbackResult, PubnubDisplayErrorMessage);
                        }

                        RadioButton radAddChannelToChannelGroup = control.FindName("radAddChannelToChannelGroup") as RadioButton;
                        if (radAddChannelToChannelGroup != null && radAddChannelToChannelGroup.IsChecked.Value)
                        {
                            DisplayMessageInTextBox("Running AddChannelsToChannelGroup:");
                            pubnub.AddChannelsToChannelGroup<string>(new string[] { userChannelName }, userChannelGroup, PubnubCallbackResult, PubnubDisplayErrorMessage);
                        }

                        RadioButton radRemoveChannelFromChannelGroup = control.FindName("radRemoveChannelFromChannelGroup") as RadioButton;
                        if (radRemoveChannelFromChannelGroup != null && radRemoveChannelFromChannelGroup.IsChecked.Value)
                        {
                            DisplayMessageInTextBox("Running RemoveChannelsFromChannelGroup:");
                            pubnub.RemoveChannelsFromChannelGroup<string>(new string[] { userChannelName }, userChannelGroup, PubnubCallbackResult, PubnubDisplayErrorMessage);
                        }

                    }
                }
                channelGroupPopup = null;
                this.IsEnabled = true;
            };

        }