MRTK 2.4 - ScrollingObjectCollection not updating via script

Question

I created a notification panel in my scene, that shows notifications when something happens. Those notifications are just buttons that get added as children to the ScrollingObjectCollection:

The issue that I have, is that after deleting one notification (that one in the middle) the collection gets not updated. But clicking in the inspector on the UpdateCollection-Btn will update the collection. I debugged and saw that it is aware that after deleting one, only two notifications are left.

private void DeleteNotification()
{
    if (NotifyManager.Instance.RemoveNotificationFromList(Id))
    {
        Destroy(this.gameObject);
        NotifyManager.Instance.ScrollingCollection.UpdateCollection();
    }
}

This is what the button UpdateCollection from the ScrollingObjectCollection in the Inspector calls and its the same method that I'm calling too:

if (GUILayout.Button("Update Collection"))
{
    scrollContainer.UpdateCollection();
    EditorUtility.SetDirty(scrollContainer);
}

Does somebody know how to update that collection on runtime via code?

My setup:

• Unity 2019.4.18
• MRTK 2.4

Answer 1

Ok, I fixed it by myself. The problem was that all happend in one frame and the ScrollingObjectCollection was not in a state where the notification was deleted. So I created another method in my NotifyManager where I wait for the end of the frame and then call UpdateCollection.

private IEnumerator WaitBeforeUpdateCollection()
{
    yield return new WaitForEndOfFrame();
    scrollingCollection.UpdateCollection();
}