Select Dropdownlist (Value Of A Column Cgridview) Without Triggering The Event Click On The Line

Hi all,

The value of my column in the CGridView is a dropdownlist. In the property "selectionChanged" I put a redirect to another page, the problem is that when the dropdownlist is selected, the page redirects.
I want select the dropdownlist, change its value, and click on the image "W" without the redirection takes place.

Thanks