How to build a collapsible sub rows grid

[pk.hafeez]

Hi,

How to build a collapsible sub row grid. For ex my grid should look like this. Im new to gxt. on click of collpase of '1' below it should display its corresponding rows. Which grid best suits the requirement. How to go about it.
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no name birthdate property Address
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>1 mark 29/12/1990
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house1 wellington
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house2 newyork
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>2 henry 28/12/1987
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house1 london
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house2 newjersy
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[pk.hafeez]

sub rows data belong to 4th(property) and 5th(address) respectively and should appear exactly in the 4th and 5th columns of respective rows