suppressing nested GridView if a row is not selected

hello, i successfully implemented this code:

http://msdn.microsoft.com/en-us/library/aa992038(v=VS.90).aspx

the problem i'm having with it is this: I need to be able to suppress the nested grid for rows which are not presently selected, otherwise the control looks completely ridiculous ( see image )
 grid problem
the nested grid should ONLY show up for "INCOME" because that is the selected parent category. housing and transportation should not display anything
dantchoAsked:
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dantchoConnect With a Mentor Author Commented:
solved it myself with FindControl construction
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dantchoAuthor Commented:
update: this was only working for me because i still had SelectedValue of the parent grid loading my select parameter of the child grid

when i try to rely solely on the code posted by microsoft, it actually doesnt work at all

SqlDataSource s = (SqlDataSource)e.Row.FindControl("SQLISPSteps");
            s.SelectParameters[0].DefaultValue = e.Row.Cells[0].Text;

the e.Rows.Cells[0].Text returns NULL when i add a breakpoint and investigate, eventhough as you can clearly see in the image i posted that the values are not null
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