Correct wxDataViewListModel::RowPrepended

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61066 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/datavcmn.cpp

@@ -510,7 +510,7 @@ void wxDataViewVirtualListModel::Reset( unsigned int new_size )
 void wxDataViewVirtualListModel::RowPrepended()
 {
     m_lastIndex++;
-    wxDataViewItem item( NULL );
+    wxDataViewItem item( wxUIntToPtr(1) );
     ItemAdded( wxDataViewItem(0), item );
 }