ComboBox entry disable

[Petrus Vorster]

I have seen this done in another program, but I am not sure if we can do it with standard comboboxes.

I have two combo's on a report wizzard form. One contains the Broad specs and the other the defining search specs.
For example. A contains 'Paying clients' 'All Clients' 'Free Users' etc.
B Contains 'Renewed', 'Due', etc.
Not all defining specs in B can be used with A but instead of making a messagebox pop up and tell you that, I was looking at the Aesthetic possibility of disabling entries in combo B. Visible, but disabled.
These would change once you click an Entry in ComboA.

It sounds better to look at than changing the full combo list or making pop-ups telling you this cannot be done.
Or am I saddling up a crazy horse on this one?