Why is Popup_Upload widget using the London-theme instead of applications theme?

Why is Popup_Upload widget using the London-theme instead of applications theme?

  
Hello,

I was wondering why the popup_upload widget is using the london-theme, instead of the theme I am using. Now I have to do some workaround or creating my own widget, just to have it look like my own theme?

Any update on this? :)
Same issue here!
doubt it gets solved, since the "architectural design" of themes has some disadvantages.
One of them, is this.