Unable to filter the report by clicking the last column's name

Hi,
I have interactive report page having lots of column. All columns were not fitting in the screen so I added a code in the region--- header and footer section---
<div style="overflow: auto; width: 1220px; height: 700px;">
I got a scroll bar at the bottom. But a new problem arised. When I am trying to filter the report by clicking the column name in the report page , a popup is opening for the first column but the pop up is not opening for the last column. For the middle columns, the popup is opening but not below its name. This pop is for filtering the report based on that columns.
Please give some idea to fix this bug.
Thanks,
Chandra Bhanu

You could try to display as many columns as fit your screen, and put the rest of your columns as form fields in a detail view, somewhat like this:
http://apex.oracle.com/pls/apex/f?p=vincentdeelen:report_details_in_iframe_v1
Please tell the steps how to do it.
Thanks,
Chandra Bhanu

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