Architecture / Design Question

Hi All
I am using vb6 to design a pretty standard business database app.
I have several   forms which can be loaded from different parts of the program for example "contact properties" or "invoices" , I need to be able to run different functions from the form that intiated opening the properties or invoice form.  What is the best and most correct way to achieve this ?
At the moment I am creating a property on the lookup form to set the name of the calling form and on closing of the lookup form using a select case structure to run the various function depending on what form the lookup was opened from.

Please forgive my lack of clear communicatiion . More info provided if needed.  

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