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/propgridiface.h

@@ -267,7 +267,11 @@ public:
     */
     wxPGProperty* RemoveProperty( wxPGPropArg id );
 
-    /** Disables property. */
+    /**
+        Disables a property.
+
+        @see EnableProperty(), wxPGProperty::Enable()
+    */
     bool DisableProperty( wxPGPropArg id ) { return EnableProperty(id,false); }
 
     /**
@@ -280,7 +284,14 @@ public:
 
     /**
         Enables or disables property, depending on whether enable is true or
-        false.
+        false. Disabled property usually appears as having grey text.
+
+        @param id
+            Name or pointer to a property.
+        @param enable
+            If @false, property is disabled instead.
+
+        @see wxPGProperty::Enable()
      */
     bool EnableProperty( wxPGPropArg id, bool enable = true );