Index: src/ch/TMsgBox.h
===================================================================
diff -u -N -r75318f0d3808d8d3c02dbc333c80b6d6e07fae13 -r8068e0c351055554340ac9755d1bc846893bf2b8
--- src/ch/TMsgBox.h	(.../TMsgBox.h)	(revision 75318f0d3808d8d3c02dbc333c80b6d6e07fae13)
+++ src/ch/TMsgBox.h	(.../TMsgBox.h)	(revision 8068e0c351055554340ac9755d1bc846893bf2b8)
@@ -41,17 +41,17 @@
 	};
 
 public:
-	TMsgBox(UINT uiMsgResourceID, EButtonConfig eButtons, EIconConfig eIcon, CWnd* pParent = NULL);
-	TMsgBox(const CString& strMessage, EButtonConfig eButtons, EIconConfig eIcon, CWnd* pParent = NULL);
+	TMsgBox(UINT uiMsgResourceID, EButtonConfig eButtons, EIconConfig eIcon, CWnd* pParent = nullptr);
+	TMsgBox(const CString& strMessage, EButtonConfig eButtons, EIconConfig eIcon, CWnd* pParent = nullptr);
 	virtual ~TMsgBox();
 
 	void SetCheckBoxMessage(UINT uiMsgResourceID);
 	void SetCheckBoxMessage(const CString& strCheckboxMessage);
 
 	bool WasChecked() const;
 
-	static INT_PTR MsgBox(UINT uiMsgResourceID, EButtonConfig eButtons, EIconConfig eIcon, UINT uiCheckboxResourceID = 0, bool* pbWasChecked = NULL, CWnd* pParent = NULL);
-	static INT_PTR MsgBox(const CString& strMessage, EButtonConfig eButtons, EIconConfig eIcon, const CString& strCheckboxText = CString(), bool* pbWasChecked = NULL, CWnd* pParent = NULL);
+	static INT_PTR MsgBox(UINT uiMsgResourceID, EButtonConfig eButtons, EIconConfig eIcon, UINT uiCheckboxResourceID = 0, bool* pbWasChecked = nullptr, CWnd* pParent = nullptr);
+	static INT_PTR MsgBox(const CString& strMessage, EButtonConfig eButtons, EIconConfig eIcon, const CString& strCheckboxText = CString(), bool* pbWasChecked = nullptr, CWnd* pParent = nullptr);
 
 protected:
 	virtual void DoDataExchange(CDataExchange* pDX);