>I created a class for a lookup form that is used through out an application. When I want to display the model form I just issue a oCal.Show(). The form displays ok then when a button is clicked it issues a THISFORM.visible = .F. and should continue program execution.
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>Needless to say the main form display cannot be accessed now, the screen just beeps whenever I try to select anything on it. I do not want to release the oCal object, but I do want to return control to he calling program. What am I missing?

The modal form by definition will stop event processing and to resume it you must kill this form first (or create and use it as modeless).