I created some sample content, linked them together (component links) and it appears in my GUI Extension and the WhereUsed window from the Component. Went to lunch, came back, list is empty. But, also when I select the WhereUsed button in Tridion 2011 SP1, it's also empty. Then, I select the 'refresh' buton on the popup and the WhereUsed items are back - but not in my GUI Extension.
I'm using the special callback fom Jaime's post here . But, is there another magic method I'm missing to reload the list?
I'm now thinking to use the Core Service to do my WhereUsed bidding for me instead of the Anguilla framework.