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Grid Lines appear in other tabs

I am using IFrames in tabs and in these IFrames asp.net gridview control is used to display data.Problem is that if there are four tabs and two tabs have asp.net gridview control then grid lines of this control also appears in the remaining two tabs too which dont have gridview control.
How to cope with this problem

You can try to use the approach  like here index.php?s=normal&q=5167&a=7637