The framework calls this member function when the nonclient area needs to be changed to indicate an active or inactive state.
Specifies when a caption bar or icon needs to be changed to indicate an active or inactive state. The bActive parameter is TRUE if an active caption or icon is to be drawn. It is FALSE for an inactive caption or icon.
The default implementation draws the title bar and title-bar text in their active colors if bActive is TRUE and in their inactive colors if bActive is FALSE.
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.