diff --git a/pcbnew/dialog_design_rules_aux_helper_class.h b/pcbnew/dialog_design_rules_aux_helper_class.h
new file mode 100644
index 0000000000..8f214299b1
--- /dev/null
+++ b/pcbnew/dialog_design_rules_aux_helper_class.h
@@ -0,0 +1,46 @@
+///////////////////////////////////////////////////////////////////////////////
+/// Class DIALOG_DESIGN_RULES
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef __dialog_design_rules_aux_helper_class_h_
+#define __dialog_design_rules_aux_helper_class_h_
+
+#include <wx/listctrl.h>
+
+/* helper class to display lists of nets and associated netclasses
+ * used in dialog design rules.
+ * It s needed because the 2 wxListCtlr used to display lists of nets
+ * use the wxLC_VIRTUAL option.
+ *  The virtual wxString OnGetItemText(long item, long column) const method
+ * must be overlaid.
+ */
+class NETS_LIST_CTRL: public wxListCtrl
+{
+private:
+    wxArrayString           m_Netnames;             ///< an array to store the list of nets (column 0)
+    wxArrayString           m_Classnames;            ///< an array to store the list of netclasse (column 1)
+public:   
+    NETS_LIST_CTRL(wxWindow* parent, wxWindowID id,
+                const wxPoint& pos = wxDefaultPosition,
+                const wxSize& size = wxDefaultSize,
+                long style = wxLC_ICON):
+            wxListCtrl( parent, id, pos, size, style )
+    {
+    };
+    
+    NETS_LIST_CTRL()
+    {
+    };
+    void setRowItems(unsigned aRow, const wxString & aNetname, const wxString & aNetclassName ); 
+    void ClearList()
+    {
+        SetItemCount(0);
+        m_Netnames.Clear();
+        m_Classnames.Clear();
+    }
+
+    virtual wxString OnGetItemText(long item, long column) const;
+};
+
+
+#endif //__dialog_design_rules_aux_helper_class_h_