User Control as Property

[StoneTheCrows]

I am Having a problem using a UserControl as a Property for another UserControl.

Scenario:

ActiveX Library containing UserControls: cDataTable and cDataDisplay

cDataTable has an array of 100 Variants called Value.
cDataDisplay Is a kind of Label that will monitor and display ONE Value element from an Instance of cDataTable.

cDataDisplay has Properties:

SourceTable as cDataTable with Get and Set Property Procedures
SourceIndex as Integer with Get and Let Property Procedures

So, cDataDisplay can access its SourceValue by :

 myValue = mySourceTable.Value(mySourceIndex)

This all works fine if the end user sets the SourceTable property of the cDataDisplay in code in his form load event or somewhere similar.

However, I do not want the end user to have to do that, I want him to be able to select the Instance of cDataTable for the SourceTable property from a drop down list of cDataTables on his form in the Properties window.

I have done this successfully in C++ and VB.NET with no special coding beyond the correct Property procedures. Why wont the SourceTable Property display in the Properties window?

I have tried this every which way I can think of in VB6, but I suspect I am just being thick.

I would appreciate any helpful comments.