Added similar assignment operator as well

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56528 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/propgridpagestate.h

@@ -297,6 +297,15 @@ public:
         Assign(other);
     }
 
+    /**
+        Additional assignment operator.
+    */
+    const wxPropertyGridConstIterator& operator=( const wxPropertyGridIterator& it )
+    {
+        Assign(it);
+        return *this;
+    }
+
 protected:
 };