The objects that create such references should clean up after themselves in Destroy. Otherwise those objects cannot be released and form cannot be released as well.

    Thisform.oGrid = NULL

>I have a form in which I have saved references to some of the objects in the form -- the Init for these objects look like:
>
> Thisform.oGrid = This
>
>This allows me to reference the grid without knowing its full containership.
>
>So, my question is this: when the form is closing, there are all these references to objects contained in ThisForm. Do I need to clean them up, or is this not a problem?
>
>Thanks in advance.