Collection Editor -> Remove Button Event

[SamSerious]

Hello,
I have some problems with the Collection Editor. I have to do some synchronizations after removing an item from the collection but can;t figure out which function I have to override.

For the "add" button works everything fine with this function:

public class myEditor : CollectionEditor
	{
	protected override object CreateInstance(Type itemType)
			{
				if (!form.IsDisposed && form.ShowDialog() == DialogResult.OK)
				{
					// [... do some stuff here ..]
				}
				else
				{
					return null;
				}
			}
	}

Now I'm searching for the function of the remove button.
Thanks in advance!