DOCUMENT:Q175325  22-OCT-1997  [vbwin]
TITLE   :PRB: Can't Create VB ActiveX Control with Embedded Licensed Ctrl
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:WINDOWS:5.0
OPER/SYS:WINDOWS
KEYWORDS:vb5all

======================================================================
---------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Visual Basic Control Creation and Professional Editions for
   Windows, version 5.0
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SYMPTOMS
========

If you embed a licensed ActiveX control inside a Visual Basic ActiveX
control and then attempt to use it on another machine, the Visual Basic
ActiveX control may fail to instantiate.

CAUSE
=====

By default, Visual Basic ActiveX controls do not support embedding licensed
controls unless the embedded control supports a particular GUID.

RESOLUTION
==========

Control vendors do not want other programmers to wrap their controls and
distribute them as their own. You may still use licensed controls in other
types of projects like ActiveX Documents or Standard EXEs.

STATUS
======

This behavior is by design.

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

When you use a licensed control in a non-ActiveX Control project, Visual
Basic caches the license key as part of the project. When you run the
program in a machine that doesn't have a design-time license, Visual Basic
will use the stored license key to instantiate the licensed control.

Licensed controls that come with Visual Basic that cannot be used inside a
UserControl include Crystal(crystl32.ocx), DBGrid(dbgrid32.ocx) and
MSChart(mschart.ocx).

The common controls in COMCTL32.OCX are licensed but were written so you
can use them in a Visual Basic ActiveX control. For a licensed control to
support being instantiated in a Visual Basic control, it needs to support a
particular GUID:

   {0x6e6e9780, 0x165d, 0x11d0, {0xb3, 0xe6, 0x00, 0xa0, 0xc9, 0x0f, 0x27,
   0x31}}

Visual Basic will call QueryInterface() on the embedded licensed control's
IClassFactory for the above GUID. If the embedded control's IClassFactory
returns S_OK and a pointer to the IUnknown interface, Visual Basic will
create the licensed control using the cached license key.
======================================================================
Keywords          : vb5all
Version           : WINDOWS:5.0
Platform          : WINDOWS
Issue type        : kbprb

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Copyright Microsoft Corporation 1997.