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Q189585: FIX: Invisible at Run Time ActiveX Control, Visible at Run Time

Article: Q189585
Product(s): Microsoft C Compiler
Version(s): 5.0,6.0
Operating System(s): 
Keyword(s): kbole kbActiveX kbCOMt kbContainer kbCtrl kbMFC kbVC500bug kbVC600bug kbGrpDSMFCATL kbN
Last Modified: 11-FEB-2002

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, versions 5.0, 6.0 
   - Microsoft Visual C++, 32-bit Professional Edition, versions 5.0, 6.0 
   - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
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SYMPTOMS
========

An invisible run-time ActiveX control is visible at run time if it is the only
control on a dialog box.

CAUSE
=====

This problem occurs because there is no other control the focus can be set to,
so AppWizard-generated MFC code sets focus to the only control there (that is,
returns TRUE in the OnInitDialog() function of your CDialog- derived class), and
therefore activates it.

RESOLUTION
==========

Change the return value of the OnInitDialog() function in your derived CDialog
class from TRUE to FALSE.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

This problem was corrected in Microsoft Visual C++ .NET.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

1. Create an MFC dialog box-based application using AppWizard.

2. Remove all controls from the AppWizard-generated dialog box.

3. Insert an ActiveX control that is invisible at run time (for example,
  Microsoft Communications Control or Microsoft Common Dialog Control).

4. Build and run the application.

RESULTS: You should see that the ActiveX control's design-time representation is
visible on the dialog box at run time.

(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Yeong- Kah
Tam, Microsoft Corporation

Additional query words: ocx design time MSComm CommDlg

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Keywords          : kbole kbActiveX kbCOMt kbContainer kbCtrl kbMFC kbVC500bug kbVC600bug kbGrpDSMFCATL kbNoUpdate 
Technology        : kbAudDeveloper kbMFC
Version           : :5.0,6.0
Issue type        : kbbug
Solution Type     : kbfix

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