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Called by the framework to determine whether a mini-frame window should be rolled up.
Called by the framework to determine whether a mini-frame window should be rolled up. The rollup/down feature will be enabled for a particular mini-frame window if it contains at least one control bar with CBRS_BCGP_AUTO_ROLLUP flag. This flag can be set when a control bar is created.
The default implementation checks whether the mouse pointer is outside of the mini-frame window bounding rectangle. You can override this behavior in a derived class.