nVIEwChanged允许从 IUIFramework和查询其状态请求一个接口。如果typeId == UI_VIEWTYPE_RIBBON和verb== UI_VIEWVERB_CREATE或UI_VIEWVERB_SIZE 例如，这会告诉你，ribbon创建或改变大小，这样你就可以查询IUnknown指针的IUIRibbon并获得其预期的高度。
为了避免上述所有的问题，把这些接口包装到类库。一个RIBBON类，并且你使用如下：
RIBBON(HWND hh = 0);~RIBBON();bool Initialize();
Ribbon初始化成功返回Ture
bool LoadMarkup(HINSTANCE hInst,LPCWSTR resourceName);
Ribbon初始化成功返回Turebool LoadMarkup(HINSTANCE hInst,LPCWSTR resourceName);
从资源里加载ribbon，如果现有的ribbon被加载，则释放它。void DestroyMarkup();销毁加载的ribbon。int& DesiredHeight();
返回理想高度ribbonvoid SetHeight(int);允许设置ribbon高度
调用类库向父窗口发送一个预定义的MESSAGE_RIBBON （const int MESSAGE_RIBBON = RegisterWindowMessage(L"{E733E4DA-904C-486b-B5FB-6201773D69DE}");),与 WPARAM设置为RIBBON *类，和LPARAM设置为RIBBON_MESSAGE结构：
struct RIBBON_MESSAGE{ IUIFramework * u_f;
// Pointer to the IUIFramework of the ribbon UINT32 cmd;
// Command ID UINT32 reason;
// Reason code (When View is changed) UI_COMMANDTYPE type;
// Type of the command UI_VIEWTYPE vtype;
// Verb Type of the view change (When View is changed) UI_VIEWVERB vverb
; // Verb of the view change (When View is changed) UI_EXECUTIONVERB verb;
// Verb of the command const PROPERTYKEY* key;
// Contains the new value const PROPVARIANT* cv;
// Contains the current value IUISimplePropertySet* pset;
// Contains an interface which you can set/query values void* view;
// Contains an IUnknown* of the view interface
// (when view is changed) which you
// can use to query for an IUIRibbon. bool update;
// true if view is changed. };
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