I found the only way was to iterate through the array property (in the form destroy), setting each element to .NULL. It didn't work to set the array property, itself, to .NULL.

>I'm working on an observer pattern utilizing a listbox as the subject, and custom classes (textbox & label) as observers. I'm using the following Attach method in the listbox:
>

lparameter oObserver
>
>if type('This.aObservers(1)') # 'O'
>	x = 1
>else
>	x = alen(this.aObservers) + 1
>endif
>
>dime this.aObservers(x)
>this.aObservers(x) = oObserver
>oObserver = .null.

>
>I can not seem to get rid of these references. When and where should I be clearing them? I've been trying to do it in the destroy event to no avail. I must be missing something...