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When I reduce the size of my application, each toolbar must be placed below the other.

Is it possible ?

You can create a test project with your improved toolbar behavior implementation and send it to us. We will check it.

and each toolbar must keep is maximum size (no hidden icon) how to do ?

By default, the toolbar’s minimum size is determined by the size of toolbar when it has at least one visible button. If several toolbars are docked into one row and you decrease the width of the main frame window, the toolbars decrease their size too. If the minimum size of each toolbar is reached, they automatically wrap. It’s possible to implement the same behavior but with toolbars keeping a large width/height. You can override the CExtToolControlBar::_SizeToolBar() virtual method, determine whether the bar is docked and simply return without invoking the parent class method invocation. You can determine whether a toolbar is docked using the dialog control identifier of toolbar’s parent window. It’s one of the AFX_IDW_DOCKBAR_*** values.

I override the method _sizeToolbar() and only do a return;

but when I resize my application my toolbar is reduce. Do you have a sample source ?