public void AddScreenshotToGroup(int groupId, ScreenshotModel screenshot)
        {
            List <ScreenshotModel> groupList = null;

            screenshotGroups.TryGetValue(groupId, out groupList);

            groupList.Add(screenshot);
        }
 public void RemoveFromAllGroups(ScreenshotModel screenshot)
 {
 }
 public void RemoveScreenshotFromGroup(int groupId, ScreenshotModel screenshot)
 {
 }