How to select a cell in listgrid using its attribute value

[rk325]

I need to paint the backgroundof a listgrid cell if the user clicks on it and edits it. How can I do this? Please I am very new to gwt so this is very difficult for me.
So far, I have defined a Hilite array:

setFieldNames("mycolumn");
setCriteria(new Criterion("mycolumn", OperatorId......, "true"));
setCssText(....)

What I need to do is paint the background of mycolumn if its attribute "att" is equal to "true"

How can I select an attribute from within Criterion?

Thanks,