>Say I have a text box on a form/window. The Refresh of the text box has a code that get the value from a child table (based on a PK) and puts it into the .Value property.
>Does this code still fire when the textbox Visible property is set to .F.?

You might check again on cntrols on inactive pages on pgf. I am more of a middle and backend coder, but dim memory hints at need to refresh on .activate on pgf...