BUG: Derived Group Class Loses Custom Properties

• Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a

SYMPTOMS

When a custom class object is added to a Group type class using the AddObject() method, the properties of that custom class object revert to its default values when that derived Group type class is viewed in the Class Designer or dropped on a form.

RESOLUTION

The custom button can be added using the ADD OBJECT clause of the DEFINE CLASS command and will retain its custom property. The bug manifests itself only when adding the custom class with the addobject() method.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

1. Copy the following code and paste it into a program named Test.prg:

   ** Code to demonstrate that when a custom class object is ** added to a Group type class the properties of that ** custom class object revert to the its default values. ** ** The code in this program could also be entered ** through the Command window. ** ** test.prg LOCAL aobj[1], xx CREATE CLASS optbut AS optionbutton OF test.vcx NOWAIT

      =ASELOBJ(aobj,1)        && Get an object reference
      xx = aobj[1]
      xx.Caption='custom'     && Demonstrate that it's custom
      KEYBOARD 'Y' CLEAR      && Avoid the dialog box - save class
      RELEASE WINDOW 'Class Designer'
   
      SET CLASSLIB to test
      CREATE CLASS optgrp AS optiongroup OF test.vcx NOWAIT
      =ASELOBJ(aobj,1)        && Get another object reference
      xx = aobj[1]
      xx.Height=xx.Height*1.5 && See that you actually ran it
      xx.AddObject('opt1','optbut')     && Add custom class object
      KEYBOARD 'Y' CLEAR
      RELEASE WINDOW 'Class Designer'
   
      MODIFY CLASS optgrp OF test.vcx NOWAIT
   
      ** The caption of the third option button has reverted to the default.
      ** This problem also occurs with the Command Button group.
      ** You can examine the Optbut class of Test.vcx with the
      ** MODIFY CLASS optbut OF Test.vcx to see that it still has
      ** the customized caption property.
   
   

2. Run that program.