The framework calls this member function when when the right or left arrow key is used to switch between the menu bar and the system menu.
A bitwise combination (OR) of flags that indicate which modifier keys are pressed. For example, the MK_CONTROL flag indicates that the CTRL key is pressed.
For a list of flags, see the "Message Parameters" subheading in About Mouse Input.
Pointer to a MDINEXTMENU structure that contains information about the menu to be activated.
This method receives the WM_UNINITMENUPOPUP notification, which is described in the Windows SDK. In response to this message, your application can set the hmenuNext member of the MDINEXTMENU structure to specify the menu to switch to, and the hwndNext member to specify the window to receive menu notification messages.
This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.
This method is supported in Windows Vista and later.
Additional requirements for this method are described in Build Requirements for Windows Vista Common Controls.