destroy cuepoints not working

[zang]

The existed cuepoints don't seem to get cleared once I call the player.destroyCuepoints(); function.
My flow is as below:

//..... Change video source to load new video
player.cuepoints(); //init cuepoints
player.destroyCuepoints(); //destroy existed ones from previous video
player.addCuepoint({}); //add new cuepoints for the newly loaded video

thanks in advance