FIX: CLEAR CLASS of Objects in Containers Causes GPF

MORE INFORMATION

In Visual FoxPro 5.0, create a form class that has a container such as PageFrame. In that PageFrame container, place a control that's created from a VCX-based class. Once the form is instantiated, released, and you execute a CLEAR CLASS command for that control class in the container, it causes the GPF.

Steps to Reproduce Behavior

1. Create a button class in Class Designer. Name the button class as mybutton and the class library as TestIPF.
2. Create a form class in Class Designer.
3. Add a PageFrame control to the form class, then subclass the above button class in Page1 of the PageFrame control.
4. Save the form class into the class library, TestIPF as testform.
5. Create a .PRG, and put the following code into the .PRG:

         LOCAL oForm
   
         SET CLASSLIB TO TestIPF
         oForm=CREATEOBJECT("testform")
         oForm.Release
         CLEAR CLASS testform
         CLEAR CLASS testbutton  && IPF here

6. Save and run the .PRG.

Immediately after you run the form, the GPF occurs when the execution hits the CLEAR CLASS command.