Added wxPGProperty::SetDefaultValue(v), as a shortcut for SetAttribute(DefaultValue, v)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60828 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/propgrid/property.h

@@ -1341,6 +1341,14 @@ public:
     */
     void SetChoiceSelection( int newValue );
 
+    /** Set default value of a property. Synonymous to
+
+        @code
+            SetAttribute("DefaultValue", value);
+        @endcode
+    */
+    void SetDefaultValue( wxVariant& value );
+
     /**
         Sets property's help string, which is shown, for example, in
         wxPropertyGridManager's description text box.