Another sticky wicket ,as I've just figured out, is that when you change stuff in your control and add it to your toolbox what I have been doing (which takes ages) is to resert the toolbox and the re-add the modified control.
No Good.
So the reason I have not been seeing the changes I made was that it was using the older version - despite showing the newer dll version number in the "CustomizeToolbox" dialog.
You simply need to close the solution and then reopen it .... refresh won't work either.
Never mind - sorted now.
Can get on and pretty it all up a bit now.
(( And now another problem - I seem to have lost my margins from my Normal style in Outlook Express - oooohhhh .... does it never end ? ))