add IsOk() to all classes having Ok() method (patch 1570985)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41751 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/palette.h

@@ -59,7 +59,8 @@ public:
                 ,unsigned char* pBlue
                ) const;
 
-    virtual bool Ok(void) const { return (m_refData != NULL) ; }
+    virtual bool Ok() const { return IsOk(); }
+    virtual bool IsOk(void) const { return (m_refData != NULL) ; }
 
     inline bool       operator == (const wxPalette& rPalette) const
         { return m_refData == rPalette.m_refData; }