PRB: ADDOBJECT Gives "A member object...already exists" Error

• Microsoft Visual FoxPro for Windows, version 5.0

SYMPTOMS

Adding an object to a container after removing that object, may result in the following error message:

   A member object with this name already exists

STATUS

This behavior is by design.

MORE INFORMATION

Visual FoxPro does not allow the removal of an object if code for that object is currently executing. Attempts to remove the object are delayed until the object code has completed execution, and Visual FoxPro does not display any warning or errors. This leads users to believe that the object has been removed when it has not been removed. Trying to add the object back into the container causes the "A member object with this name already exists" error because the object was not removed and is still a part of the container.

Steps to Reproduce Behavior

1. Execute the following code (which instantiates a Form with a CommandButton object):

         PUBLIC oF
         oF = CreateObject('form')
         oF.AddObject('oCont','Cont')
         oF.Show()
   

         DEFINE CLASS Cont AS Container
           ADD OBJECT oCmd AS Cmd
           Visible = .t.
         ENDDEFINE
   
         DEFINE CLASS Cmd AS CommandButton
           Top = 50
           Visible=.t.
           PROCEDURE click
             oF.RemoveObject('ocont')     && No error occurs
             oF.AddObject('ocont','cont') && Produces error
           ENDPROC
         ENDDEFINE
   
   

2. When the Form appears, click on the command button. The "A member object with this name already exists" error message appears.