Only allow PTT and page on selected channels

WhackerLinkConsoleV2/ChannelBox.xaml.cs

@@ -166,12 +166,16 @@ namespace WhackerLinkConsoleV2.Controls
 
         private void PTTButton_Click(object sender, RoutedEventArgs e)
         {
+            if (!IsSelected) return;
+
             PttState = !PttState;
             PTTButtonClicked.Invoke(sender, this);
         }
 
         private void PageSelectButton_Click(object sender, RoutedEventArgs e)
         {
+            if (!IsSelected) return;
+
             PageState = !PageState;
             PageButtonClicked.Invoke(sender, this);
         }

WhackerLinkConsoleV2/MainWindow.xaml.cs

@@ -774,6 +774,9 @@ namespace WhackerLinkConsoleV2
             Codeplug.Channel cpgChannel = Codeplug.GetChannelByName(e.ChannelName);
             IWebSocketHandler handler = _webSocketManager.GetWebSocketHandler(system.Name);
 
+            if (!e.IsSelected)
+                return;
+
             if (e.PttState)
             {
                 GRP_VCH_REQ request = new GRP_VCH_REQ