>Is it possible to cycle through all text box controls on a form and set their tooltip property based on the field comments defined in the DBC?
>
>TIA

Don't cycle through them, let your textbox class do it in it's init event:

IF MEPTY(THIS.toolTipText) AND !EMPTY(THIS.ControlSource)
    THIS.ToolTipText = DBGETPROP(THIS.ControlSource, "Field", "Comment")
ENDIF