public static void RemoveOnVideoFinishedMethod(AdColony.VideoFinishedDelegate onVideoFinished)
 {
     AdColony.OnVideoFinished -= onVideoFinished;
 }
 //-----------------
 public static void AddOnVideoFinishedMethod(AdColony.VideoFinishedDelegate onVideoFinished)
 {
     AdColony.OnVideoFinished += onVideoFinished;
 }