GWT groupabled Rows in celltable or in datagrid - gwt2

I beginn to learn GWT, now need celltable groupable. just like in OUT Look, for example, die E-mails can be accroding to the date grouped.(today,yersterday,or this week...) one kann expand or close the rows. and dynamic sorted!
Somebody can help me? thank you very much!

Check this link
Link
GWT showcase example. try to customise with GROUPING, EXPAND/COLLAPSE, SORTING features.
If hav any queries post with sample code.

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Sorry, my English is not very good, so I use a little translation. I'm attaching a picture just in case.
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I was able to find a few solutions.
It is the Favorites window.
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screenshot

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Don't hesitate to share an URL or HTML code if my answer is not correct.
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