> Geoff, this seems to be normal behaviour when
> dropping a control into the grid - its Visible
> property automatically gets switched to False.
> I don't remember this occurring with IBO 3.x
> but I can't say it didn't occur, either.

I dont see this behavious here with IB_LookupCombo, IB_ComboBox or my
Enhanced Components. I tried various things and could not get the
exception.

D5 Pro, W2KPro, IBO4.2.Ef

I have seen the error occur in other circumstances (due to bugs in my
code when developing the Enh components).

IB_Grid has always set Visible to false on controls dropped onto it.
At designtime this does(/should) not have any impact since the control
is never actually focused or made invisible.

Can anyone give me a detailed description of the sequence required to
generate the error?

Geoff Worboys
Telesis Computing