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Hello.

When Bar was done Show of, please teach a called virtual function.

Thanks, 

Please process a WM_WINDOWPOSCHANGED message in the WindowProc() virtual method so that you can check if the control bar is visible using the CControlBar::IsVisible() method.

You should handle a WM_WINDOWPOSCHANGED message for your control bar and determine whether the control bar contains the WS_VISIBLE style . It should be created without the WS_VISIBLE style.

Hello.

What kind of message should I judge it by?

The window displayed from auto-hide tabs using the sliding animation is called the auto-hide slider control. This window looks like control bar but it’s not a control bar. The bar’s child window (color picker on your screen shot) is temporarily moved into the auto-hide slider window when it should be displayed from auto-hide tabs. So, the bar’s child window can simply handle the WM_WINDOWPOSCHANGED message and detect whether it’s parent is the CExtControlBar window. If the parent of color picker window is not the CExtControlBar window, then the color picker is displayed from auto-hide area.

I want to catch WM_SHOWWINDOW.

In WindowProc, I cannot catch it

There is a CExtControlBar::OnControlBarPositionChange() virtual method ,which is invoked when the window visible state and/or window position the control bar has changed.

Hello.

When a bar was displayed for the first time, I want you to teach a virtual function.