Add Button To in Image Gallery toolbar

Hi all,
I want to add a button in a panel in my own object. I was successful in adding an icon and handler in Object Editor.
I have tried all the ext js JavaScript UI Events in my own js file and only the postOpenObject gets executed, in this Object i can see tabpanel and menu items but its too big go through every items or cannot really figure out under which menu i can add my own menu button handler. All the Javascript UI is not executing


I extended the Imagegallery js class with all functions in my own custom js file and added my own button in between the buttons.

Hope this will help someone looking for a solution like me.