Fixed a bug where a newly created Audio.pck would be hidden from the user

PCK-Studio/MainForm.cs

@@ -831,6 +831,7 @@ namespace PckStudio
                 PCKAudioFileWriter.Write(stream, audioPck, isLittle);
                 pckFileData.SetData(stream.ToArray());
             }
+			BuildMainTreeView();
             return pckFileData;
         }