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I have a combo box in one of my toolbars and it works fine until I dock it on either side of my application. The combo box turns into a button, which I would expect, but the command handler for that button is never called. Am I doing something wrong? Should this work?

Thanks

The command handler should be invoked if you correctly handle the button command. Please note that you can use a flag indicating whether the window associated with the button on the vertically docked toolbar should be visible. You can do this with CExtBarButton::SetCtrlVisibleVertically():

pTBB->SetCtrlVisibleVertically( true )

Please take a look at the ProfStudio sample and find two toolbars Standard and Web. In the first toolbar the Find edit box is visible when the toolbar is docked vertically. In the second toolbar the URL combo box is not visible when it is docked vertically but the command handler works OK.