cannot seek to previous cue point

Problem with a seek function on a button, I would like a skipping backwards function with the latest media player component, am not able to see why the below doesent work.

Code:

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//add a cue point
for (var a = 0; a<10; a++) {
        video1.addCuePoint("cue"+a, a);
        video1.setFLVCuePointEnabled(true, "cue"+a);
}
//video1.addCuePoint("cue0", 0);
//video1.setFLVCuePointEnabled(true, "cue0");
backBttn.onPress = function() {
        trace("time is "+video1.playheadTime);
//video1.seekSeconds(time:Number)
        video1.seekToPrevNavCuePoint(video1.playheadTime-1);
        //video1.seekToNavCuePoint("cue0");
};

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interestingly though the traced playheadTime is skipping back ! but it doesnt actually go back in the video.. :yikes: