There is no property that controls this.
The clicking in being handled down in the cell''s active control, so it is buried deep. Trying to catch clicks at teh grid level does not catch this action. Hence, the reason the work-around involves deriving the cell control.
Here is that sample in VB. In any grid where you wanted some comboboxes that did not have this double click, you would to include this code. (Or, you could derive a grid, and add this custom cell types to your derived grid''s CellModels collection. Then when you wanted a grid to have comboboxes that do not respond to a double click, you can use your derived grid class instead of our grid class).
DerivedComboBoxCell_VB_160.zip