Fixed various inconsistencies with deleting properties, added wxPGProperty::DeleteChildren()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57442 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/property.h

@@ -1443,6 +1443,11 @@ public:
         return false;
     }
 
+    /**
+        Deletes children of the property.
+    */
+    void DeleteChildren();
+
     /**
         Removes entry from property's wxPGChoices and editor control (if it is
         active).
@@ -2073,9 +2078,6 @@ public:
     /** Returns index of given child property. */
     int Index( const wxPGProperty* p ) const;
 
-    /** Deletes all sub-properties. */
-    void Empty();
-
     // Puts correct indexes to children
     void FixIndicesOfChildren( unsigned int starthere = 0 );
 
@@ -2205,6 +2207,9 @@ protected:
 
     void DoSetName(const wxString& str) { m_name = str; }
 
+    /** Deletes all sub-properties. */
+    void Empty();
+
     void InitAfterAdded( wxPropertyGridPageState* pageState,
                          wxPropertyGrid* propgrid );