Adjust dataGrid size to his content

Hi
I have a data grid... when i click a Button I populate this dataGrid with some information from a java server.
I want to know how can i adjust the numer of rows and the size of the columns to the information i get dinamically...
thanks a lot!

Hi, Alex, thanks for the info. It turns out, I was wrong. The way it looked made me think it was a row-resizing problem, but it turns out that the rows were resizing fine... it was the outer datagrid itself that was not resizing properly. Apparently it has to do with the combination of variableRowHeight and rowCount. The jira issue may look familiar to you.
http://bugs.adobe.com/jira/browse/SDK-13507
Anyway, I got this from the jira comments and works pretty good...
height="{theGrid.measureHeightOfItems(-1, theGrid.dataProvider.length + 1)}"
I also have to call similar code when the data provider of the inner grids add/remove items.
Thanks!

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I don't need 30% ... i just need that me tree as a mininal width
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<f:facet name="top">
<af:panelHeader text="#{res['classification.repository.entryList.panelHeader.title']}"/>
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Adjust dataGrid size to his content

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