We are using an UltraGridColumnChooser on the majority of the grids in our application. The users have recently requested the ability to select or deselect all of the columns in the column chooser. I thought this would be real simple but I can't seem to access the check box control of the column chooser to check or uncheck the different columns. I've tried setting the cell's value with no luck. I initially figured I would have to do some kind of cast to a checkbox editor but the editor property of the cell is always null. Is it possible to do what I'm attempting? What property do I need to access to check and uncheck the column's checkboxes, or is there a method available on the control to automatically check all of them? I'm using v8.3. Thanks in advance.