[HitnKill]

PHP Code:

public OnPlayerClickTextDraw(playerid, Text:clickedid)
{
  if(clickedid == Text:INVALID_TEXT_DRAW)
  {
        // your code
  }
  return 1;
} 


And if you use OnPlayerClickPlayerTextDraw you detect ESC with OnPlayerClickTextDraw.

ps: never use CancelSelectTextDraw when the player ESC on select textdraw.