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CellTable/DataGrid wrapped by TabLayoutPanel (non active tab): Table not filled
Jul 7th, 2012 by P.G.Taboada

Finally, the issue CellTable/DataGrid wrapped by TabLayoutPanel (non active tab): Table not filled seems to be fixed by 2.5 RC1. Just in case you are stuck with a previous version of GWT for now, try using the following workaround:

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