How to control position of subtitles...?

I have a bit of video that has a subtitle stream (i.e. the kind you can turn on / off, not the kind 'burnt in' to the video image).  The video is wide-screen movie aspect ratio, and I can see the subtitles fine on my iPad both when viewing in letterbox format - where the subtitles appear below the video image (in the black 'letterbox area) and in fullscreen mode (i.e. using all iPad screen, but missing detail to left and right - subtitles appear in a translucent grey overlay at bottom of image). 
When I try to watch the same footage on my TV (16:9 ratio screen) via Apple TV 2, the bottom part of the subtitle text is not visible on-screen - I only see half the subtitle text.
The Apple TV 2 is trying to position the subtitles in same place iPad does in letterbox format - i.e. 'below' the video image.  Trouble is, the TV is widescreen model, and so the 'letterbox' margin above and below the video image is much less than when on the iPad, but the ATV doesn't seem to realise and draws the subtitles 'below' the bottom of the TV screen. 
This happens both when trying to watch the clip via ATV directly, and sending it from the iPad via AirPlay.
On video clips with subtitles that have an aspect ratio that matches the TV aspect ratio, the subtitles appear on-screen via similar translucent overlays.  But I cannot find a mechanism to 'force' the ATV2 to use this method to display the subtitles so I can see them... 
Does anyone know if there is a a way to force ATV to display the video in this way?

Hi Tst, thank you for your reply. I could not create a property node for the subVI. How to get app control palette form block diagram? I have attached a sample vi which is similar to my application. Could you modify the code so that the pop-up window's position can be controllable? Thanks again.
Attachments:
Window.zip ‏13 KB

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