SeekBar and FullScreen Mode

I’ve created a video player that uses the SeekBar component and FullScreen Mode. I have set things up so the controls are visible in Fullscreen mode.

When in full screen mode the SeekBar expands and stretches across the stage. When this happens the position of the handle on the SeekBar is out of sync with the video.

Os there a property or method that allow me to set a new width for the bar, or set the range of the SeekBar to keep it in sync with the width of the bar as it changes?