Update Facebook Login Popup window size

Hi,

http://docs.appcelerator.com/titanium/3.0/images_download_attachments_29004920_facebook.png

I need to update the size of the facebook login popup window to have the whole width and size of the device instead of the default size which positions the popup in the center covering 25% of the screen and Is is possible to change the background image of the window which is currently white in color with login options on top of it.let me know if that can be done.Thanks