how to expends the rows of gwt ext's grid

Hello Friends.

How are You all.

My question is that..

Can we create grid like smartGwt's Grid by using gwt-ext?

I have created smartGwt Grid but smartgwt is little bit slower then
gwt ext, so now i want to create grid in gwt.
but my problem is that i don't know how to add rows expansion in gwt
ext's grid like the smartGwt's Grid.

I have created smart Gwt's showcase below written example...

Grids------->expanding Rows----------->Memo Rows...

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