FIX: CLEAR ALL with Object References Causes Page Fault

MORE INFORMATION

Steps to Reproduce Behavior

1. Create and run a program containing the following code:

         oform = CreateObject( "Form" )
         oform.AddObject("X", "CB")
         oform.AddObject("Y", "CB")
         oform.y.pointer=oform.x
         oform.x.pointer=oform.y
         CLEAR ALL  && This causes an Invalid Page Fault and
                    && shuts down Visual FoxPro.
   
         DEFINE CLASS CB as CommandButton
           pointer= .NULL.
         ENDDEFINE
   							

      oform.removeobject("X")
      oform.removeobject("Y")