User Control behaves differently in Excel User Forms

I created a UserControl (ocx) with VB6 that has implements a Textbox as a
constituent control.

Everything seems to work correctly in the VB6 test project and other VB6
Forms.

When I use the control on a user form in Excel 2K the Properties windo soes
not display all the Properties of the Control. When I look in the Object
Browser, all the properties are there and they are Public.

Why do some of the propertiesd not show in the VBA IDE? Is there something
special I should know about when designing UnserControls for Office?

Any advice or insights would be appreciated.