Added wxPGProperty::Enable() for conveniency. Refactored related code and improved related documentation.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65216 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/property.h

@@ -1523,6 +1523,17 @@ public:
     */
     void DeleteChoice( int index );
 
+    /**
+        Enables or disables the property. Disabled property usually appears
+        as having grey text.
+
+        @param enable
+            If @false, property is disabled instead.
+
+        @see wxPropertyGridInterface::EnableProperty()
+    */
+    void Enable( bool enable = true );
+
     /**
         Call to enable or disable usage of common value (integer value that can
         be selected for properties instead of their normal values) for this
@@ -2357,6 +2368,8 @@ protected:
     // Removes child property with given pointer. Does not delete it.
     void RemoveChild( wxPGProperty* p );
 
+    void DoEnable( bool enable );
+
     void DoPreAddChild( int index, wxPGProperty* prop );
 
     void SetParentState( wxPropertyGridPageState* pstate )