Hi rangderem,

Thank you for posting in the community.

You can disable editing on a UltraWebGrid column by setting the AllowRowFiltering property of that column to false. This will visually dim the filter icon for the desired column. If you want to further modify the look of the disabled filter cell, you may access it by handling the InitializeLayout clientside event. For instance:

function UltraWebGrid1_InitializeLayoutHandler(gridName){
    var filterCellToModify = igtbl_getGridById(gridName).Rows.FilterRow.getCellFromKey("ChildName").Element;
}

Please note that the UltraWebGrid control is now outdated and as of .NetAdvantage 2011 Volume 2 is no longer included in our product package. I would suggest that you consider switching to the WebDataGrid/WebHieararchicalDataGrid. More information regarding these controls is available at:

http://help.infragistics.com/NetAdvantage/ASPNET/2011.2/CLR4.0/?page=Web_WebDataGrid_WebDataGrid.html

Additional samples demonstrating the features of these grids can be found at:
http://samples.infragistics.com/aspnet/

Let me know if this helps.