Customize prompt lookup behavior in a dbgrid

How can I set a column in a dbGrid to ignore the prompt under certain circumstances?

1. Via customizing the prompt method in the object

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Procedure Prompt   Integer iColumn   Boolean bOk      move (true) to bOk   Get Current_Col To iColumn   If (iColumn=4) Begin     // if in column 4 then check data     Get Field_Current_Value Of Server_DD Field Foo.bar To sBar     If (sBar="foo") Move (false) To bOk   End   If (bOk) Begin     Forward Send Prompt   End Procedure // Prompt

2. Via entry_display

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if(certain circumstances) begin     Set Prompt_Button_Mode to pb_PromptOff   end and   On_Key kPrompt Send myprompt     Procedure Myprompt     if(not((certain circumstances)) forward send prompt   End_Procedure