Can't write my properties in the general property window

Hi,

I wrote a activeX Form with several properties. I can see the
properties in the general property window (in excel, click right mouse
button and select properties). I can read and write all properties
with the type "OLE_xxx", const enum and width,height,top and left, but
the properties with type int, long, BSTR etc. are only readable.

What's wrong.

Robert