Custom Tab Controls, Tabbed Frame and Tabbed MDI

// History of TabbedFrame.h prior to codeproject article about it
//
// History (Date/Author/Description):
// ----------------------------------
//
// 2002/06/12: Daniel Bowen (DDB)
// - CCoolTabOwnerImpl:
//   * Don't use extra boolean "m_bTabAreaOnTop".  Just depend on "bottom" style.
//   * CreateTabWindow: Allow custom tab control styles to be passed in
//   * DisplayTab: Fix bug where "ShowTabs" was only being called if the
//     window being added had window text
//   * Rename to CCustomTabOwnerImpl
//   * "SetTabAreaHeight" and "CalcTabAreaHeight" as "overrideable" methods
//   * "GetTabAreaHeight"
//   * Call pT->CalcTabAreaHeight(); in CreateTabWindow
//   * Don't reference CCoolTabItem directly, reference TTab::TItem
//     (which now is more likely to be CTabViewTabItem)
// - CTabbedFrameImpl:
//   * Notifications don't have to be reflected, but the user might still
//     want them reflected (if subclassing a common control window for example)
//     Expose "SetReflectNotifications" and "GetReflectNotifications"
//   * Update "TCN_*" to "CTCN_*"
//   * "UpdateTabAreaHeight" is now in CCustomTabOwnerImpl::CalcTabAreaHeight
//   * Override new "SetTabAreaHeight" to update layout and invalidate
// - CTabbedPopupFrame:
//   * Don't have "_Top" as a template parameter.
//   * In the constructor, allow the client to indicate they want
//     notifications reflected
//
// 2002/04/30: Daniel Bowen (DDB)
// - CTabbedFrameImpl - handle WM_FORWARDMSG by forwarding the
//   message to the active tab view.
//
// 2002/04/23: Daniel Bowen (DDB)
// - New "CCoolTabItem" class used instead of TCITEM.
//   See "CoolTabCtrls.h" for an explanation.
// - New CCoolTabOwnerImpl::UpdateTabToolTip
// - New CCoolTabOwnerImpl::UpdateTabImage
// - ATL 7 compatibility issues pointed out to me by
//   Ramon Casellas [casellas@infres.enst.fr]
//
// 2002/04/22: Daniel Bowen (DDB)
// - CCoolTabOwnerImpl: Add several more methods for getting an image
//   into the image list and associated with a tab.  With the updates,
//   you can now more easily add images independant of adding a tab.
//   IMPORTANT: If you've used this code in the past, its important
//    to use "AddTabWithIcon" instead of "AddTab" if you are adding
//    a tab with a resource identifier of an icon.
// - CTabbedFrameImpl: Make the tab area height dependant on
//   the same metrics that the font of the tabs depends on.
//
// 2002/04/05: Daniel Bowen (DDB)
// - Update CTabbedFrameImpl::OnSetFocus to not check for
//   IsWindowVisible(m_hWndActive).  When the frame is maximized,
//   ::IsWindowVisible(m_hWndActive) will return FALSE,
//   which results in the focus not being forwarded
//   to the active tab window.
//   See http://www.codeproject.com/useritems/WTLMDIChildMax.asp
//   for an explanation.

// 2002/03/13: Daniel Bowen (DDB)
// - Remove notification handler for NM_RCLICK from CTabbedFrameImpl.
//   The implementation is correct when a tree view is the active child,
//   but not necessarily for other windows (most notibly a list view).
//   Since notifications are getting reflected back anyway, let the
//   child deal with NM_RCLICK as appropriate

// 2002/03/11: Daniel Bowen (DDB)
// - CTabbedFrameImpl:
//   * Added handler for WM_SETFOCUS to set focus to active child
//     (similar to how CFrameWindowImplBase::OnSetFocus does it
//      in the normal case when there's a child/client window)
//   * For key messages, if the baseClass message map hasn't
//      handled it, re-send the message to the active child window

// 2002/02/07: Daniel Bowen (DDB)
// - New CCoolTabOwnerImpl MI class resulting from
//   refactoring due to commonality that existed between
//   CTabbedFrameImpl and CMDITabOwner.  Use this
//   class to help implement a windowing class that
//   will contain a CoolTabCtrl.
// 
// 2002/01/31: Daniel Bowen (DDB)
// - Original Release
//