How to load data BEFORE showing view/presenter?

Hi.

If you poke around some of Google's GWT apps, you'll find that when
you click on anything which requires more data to be loaded, that a
'loading' sign is displayed at the top of the screen, and while
loading, it stays on the current view, and then when the data for the
next view has been downloaded, the loading sign is removed and the new
view is shown.

How can I implement this behavior?

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