Hi Naomi,

>What if the ControlSource is a complex expression? How would we determine if it's an expression or a real field?

Precisely for these reasons I've given up on trying to figure out the content of the ControlSource myself. When I have a complex control that needs it's own control source, I use an invisible textbox for data storage and retrivial. The complex class creates this textbox, sets the controlsource to its own property and then uses the Value property to read and write. Any code that tries to parse the ControlSource only works in specific environments, but a generic solution is quite complex.