I have a page with two links that will open two different SharePoint modal dialog. Each of this modal dialog contains a SPGridView data control with Allow Filtering set to True. My problem is that only one of the spgridview is working fine, the other will throw a javascript error. In FireBug the error is CAMOpt is not defined. After comparing both spgridview I've found out that the visibility of the filter image is set to hidden. Please refer to the image below


How can I fix this thing. Really appreciate any help. Thanks