upgrading incoming call screen need help !!

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I'm currently using probex tf windows 7 theme and the incoming call screens both port/land and the dialer screens are basically the default black s2a..so I customized every file just about but have 1 issue..in landscape view when on a call there is a big white bg around the end call button and I cant find a way to remove this or which file it is, can someone please help me??

example image below, please help I've been working on this for a week or so and this is basically the last step removing this white block!!