GWT2.1 - Progress Bar Cell & DataProviders

I am in the process of creating a Progress Bar Cell that will work in
a GWT2.1 CellTable. So far I have the cell rendering a simple html
progress bar in a manner that is consistent with other cell renders.

I need to somehow update the progress bar cell value after receiving a
new value. Should I be using the updateRowData method on the
AsyncDataProvider?

Also, is there a logical place to include the polling code within the
CellTable/DataProvider/.. architecture? Maybe a
PollingAsyncDataProvider or something.

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