>>>(5) the checkbox column should have a DynamicCurrentControl based on the value of the field in (1)
>>>You better add a DynamicBackColor showing whether the checkbox is enabled
>>
>>What BackColor do you suggest to show clearly enabled / disabled status?
>>
>>Thanks again.
>
>White for enabled, grey for disabled ?

Ok, I'll try that, thanks. Trying to solve a bit more complex problem now.

In the combobox I select an operator. I want to prevent selecting the same operator the second time. The grid is bound to the table in buffering 5 mode.

So, I press add button and add a new operator to the grid by selecting from the grid's combo. How can I check if that operator already exists or not?

Thanks again.