DAX FAQs 1.0
  by Conrad Herrmann
24 June 97
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Q: How does the ActiveX Control wizard control convert properties?  
   Which properties are converted and which aren't?

The wizard converts properties that can be directly mapped to standard OLE 
types.  OLE types include: 

Q: How can I have my TBitmap property converted?

TBitmap is not a standard OLE type, but there is a standard OLE type called
Picture.  An OLE picture is like a VCL TPicture object in that it can 
hold pictures of different types.
Delphi's ActiveX control wizard converts properties of type TPicture 
automatically to an OLE picture, using an adapter object.

So, the easiest thing to do is change the TBitmap property to a TPicture 
property.