C++ WinApi Wrapper Class is it a good idea to add destroywindow() to destructor?

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C++

So I wrote the UnregisterClass() function into the Window Class Destructor, and a random thought struck me. Should I also include the DestroyWindow(); WindowHandle = Null; in the destructor? More than likely the window will be destroyed through the Window Procedure, but is it a good idea to include it in the Destructor on the off chance the class is destroyed while the window is open?

Window::~Window(){
	DestroyWindow(WinHandle);
	WinHandle = NULL;
	UnregisterClass(ClsName.c_str(), MyApp->GetInstance());
}

Window Wrapper Class

class Window{
public:
	Window();
	~Window();

	bool DefineClass(int ClassName, WNDPROC WindowProcedure);
	bool DefineClass(int ClassName, WNDPROC WindowProcedure, int Menu);

	bool CreateNewWindow(int ClassName, int WinTitle, DWORD Style, DWORD ExStyle,  RECT WindowSize, bool Centered, HWND Parent, LPVOID lpParam);

	bool CreateNewWindow(int ClassName, int WinTitle, DWORD Style, DWORD ExStyle, RECT WindowSize, bool Centered);

	void Show(void);
	void Show(int nCmdShow);

	HWND GetWinHandle(void);

private:
	HWND WinHandle;
	std::wstring ClsName;

};

The AppClass Creates the Message Window and provides functions to pass information to the seperate windows...

class AppClass{
public:
	AppClass(HINSTANCE hInstance, POINT MinScreenResolution);
	~AppClass();

	bool CreateMsgWindow(void);

	int Error(int ErrorID);

	std::wstring SetText(int TextID);

	int Run(void);
	int Run(int AcceleratorID);


	void QueryScreenResolution(void);
	
	bool CreateTrayIcon(void);
	void KillTrayIcon(void);


	HINSTANCE GetInstance(void);
	POINT GetScreenResolution(void);
	RECT GetMaxWindowResolution(void);
	HWND GetMsgWindowHandle(void);
	HWND GetWindowHandle(int ClassName, int WindowTitle);
	
private:
	HINSTANCE AppInstance;
	NOTIFYICONDATA NID;

	RECT MaxWindowResolution;  
	POINT MinScreenResolution;
	POINT ScreenResolution;
	Window *MsgWindow;

	int InitializeProgram(void);
};

Also, in case I failed to mention, just a hobby. This application is just a excercise in the Windows API plus I wanted to test if there is any benefit to a message window. And I am testing the effectiveness of encapsulating the Window Procedure Versus having it run outside of any specific class. I have some theories on the added overhead of encapsulating the procedure... So basically just a learning program.