See attached Sample   2005-04-26_132423_CustomizeDlg.zip

Thanks Oleg

I thought of Outlook's "New" button as an exception rather than a rule. A good exception.

Back to the problem. What would be a good place and time to call SetIconId. Obviously I cannot do it when processing ON_COMMAND as the command could have been triggered by a shortcut or a context menu. Overriding OnExecute in CXTPControl-derived classes (e.g. CXTPControlButton) also does not look like a good idea. This way I will end up overriding lost of classes due to the nature on CXTPControl creation framework (which is somewhat hard-coded; calls like CXTPControlButton::CreateObject do not leave space for flexibility).

Can you recommend a solution?

It is designed behaviour. You must manually change it. For example "New" button of Outlook don't change self icon.

pControl->SetIconId.

There is something wrong with xtpControlSplitButtonPopup style toolbar buttons. When I select a button from drop-down choices I expect the selected button to replace the main button. For example check XT's Visual Studio 7 sample app, Class View button (on the right). Even if I select Output from the drop-down the main button stays Class View. Compare it with actual Visual Studio 2003. Also check any other MS applications with split toolbar buttons, e.g. Word, Excel.