Assign Custom Button To Window

[veriongt 0]

Hi i am trying for a week now working on (classic interlude)
I have creater a custom button through interface.xdat and assigned close to menu bottom right 
But i am trying it when i click the custom button to pen a WND (TeleportationBookmarkWnd) but not luck anyone can give me any hint how and where to look in order to work?

[Saltfire 80]

Is the event and script attached to the button?