Seek bar little customization...

Hi All

I would like to change something in the seek bar (i think) in the skin. Normally info looks like this...



...but i would like to be displayed only info when the movie ends, and before that information i want to add text "End at: 12:15" I have notepad++, and i try to do it myself, but no results Anyone can help, which xml can i edit, and which lines? Is it DialogSeekBar.xml?

Thanks, and sorry for my English