diff --git a/include/wx/selstore.h b/include/wx/selstore.h
index bf5760e336..d987111259 100644
--- a/include/wx/selstore.h
+++ b/include/wx/selstore.h
@@ -18,14 +18,12 @@
 // wxSelectedIndices is just a sorted array of indices
 // ----------------------------------------------------------------------------
 
-inline int CMPFUNC_CONV wxSizeTCmpFn(size_t n1, size_t n2)
+inline int CMPFUNC_CONV wxUIntCmp(unsigned n1, unsigned n2)
 {
     return (int)(n1 - n2);
 }
 
-WX_DEFINE_SORTED_EXPORTED_ARRAY_CMP_SIZE_T(size_t,
-                                           wxSizeTCmpFn,
-                                           wxSelectedIndices);
+WX_DEFINE_SORTED_EXPORTED_ARRAY_CMP_INT(unsigned, wxUIntCmp, wxSelectedIndices);
 
 // ----------------------------------------------------------------------------
 // wxSelectionStore is used to store the selected items in the virtual
@@ -42,24 +40,24 @@ WX_DEFINE_SORTED_EXPORTED_ARRAY_CMP_SIZE_T(size_t,
 class WXDLLIMPEXP_CORE wxSelectionStore
 {
 public:
-    wxSelectionStore() : m_itemsSel(wxSizeTCmpFn) { Init(); }
+    wxSelectionStore() : m_itemsSel(wxUIntCmp) { Init(); }
 
     // set the total number of items we handle
-    void SetItemCount(size_t count) { m_count = count; }
+    void SetItemCount(unsigned count) { m_count = count; }
 
     // special case of SetItemCount(0)
     void Clear() { m_itemsSel.Clear(); m_count = 0; m_defaultState = false; }
 
     // must be called when a new item is inserted/added
-    void OnItemAdd(size_t WXUNUSED(item)) { wxFAIL_MSG( _T("TODO") ); }
+    void OnItemAdd(unsigned WXUNUSED(item)) { wxFAIL_MSG( _T("TODO") ); }
 
     // must be called when an item is deleted
-    void OnItemDelete(size_t item);
+    void OnItemDelete(unsigned item);
 
     // select one item, use SelectRange() insted if possible!
     //
     // returns true if the items selection really changed
-    bool SelectItem(size_t item, bool select = true);
+    bool SelectItem(unsigned item, bool select = true);
 
     // select the range of items
     //
@@ -67,15 +65,15 @@ public:
     // which have changed state if "few" of them did, otherwise return false
     // (meaning that too many items changed state to bother counting them
     // individually)
-    bool SelectRange(size_t itemFrom, size_t itemTo,
+    bool SelectRange(unsigned itemFrom, unsigned itemTo,
                      bool select = true,
                      wxArrayInt *itemsChanged = NULL);
 
     // return true if the given item is selected
-    bool IsSelected(size_t item) const;
+    bool IsSelected(unsigned item) const;
 
     // return the total number of selected items
-    size_t GetSelectedCount() const
+    unsigned GetSelectedCount() const
     {
         return m_defaultState ? m_count - m_itemsSel.GetCount()
                               : m_itemsSel.GetCount();
@@ -86,7 +84,7 @@ private:
     void Init() { m_defaultState = false; }
 
     // the total number of items we handle
-    size_t m_count;
+    unsigned m_count;
 
     // the default state: normally, false (i.e. off) but maybe set to true if
     // there are more selected items than non selected ones - this allows to
@@ -99,6 +97,5 @@ private:
     DECLARE_NO_COPY_CLASS(wxSelectionStore)
 };
 
-
 #endif // _WX_SELSTORE_H_
 
diff --git a/src/generic/selstore.cpp b/src/generic/selstore.cpp
index 816ed07939..2422bd8057 100644
--- a/src/generic/selstore.cpp
+++ b/src/generic/selstore.cpp
@@ -33,7 +33,7 @@
 // tests
 // ----------------------------------------------------------------------------
 
-bool wxSelectionStore::IsSelected(size_t item) const
+bool wxSelectionStore::IsSelected(unsigned item) const
 {
     bool isSel = m_itemsSel.Index(item) != wxNOT_FOUND;
 
@@ -46,7 +46,7 @@ bool wxSelectionStore::IsSelected(size_t item) const
 // Select*()
 // ----------------------------------------------------------------------------
 
-bool wxSelectionStore::SelectItem(size_t item, bool select)
+bool wxSelectionStore::SelectItem(unsigned item, bool select)
 {
     // search for the item ourselves as like this we get the index where to
     // insert it later if needed, so we do only one search in the array instead
@@ -75,14 +75,14 @@ bool wxSelectionStore::SelectItem(size_t item, bool select)
     return false;
 }
 
-bool wxSelectionStore::SelectRange(size_t itemFrom, size_t itemTo,
+bool wxSelectionStore::SelectRange(unsigned itemFrom, unsigned itemTo,
                                    bool select,
                                    wxArrayInt *itemsChanged)
 {
     // 100 is hardcoded but it shouldn't matter much: the important thing is
     // that we don't refresh everything when really few (e.g. 1 or 2) items
     // change state
-    static const size_t MANY_ITEMS = 100;
+    static const unsigned MANY_ITEMS = 100;
 
     wxASSERT_MSG( itemFrom <= itemTo, _T("should be in order") );
 
@@ -102,7 +102,7 @@ bool wxSelectionStore::SelectRange(size_t itemFrom, size_t itemTo,
             // TODO: it should be possible to optimize the searches a bit
             //       knowing the possible range
 
-            size_t item;
+            unsigned item;
             for ( item = 0; item < itemFrom; item++ )
             {
                 if ( selOld.Index(item) == wxNOT_FOUND )
@@ -166,7 +166,7 @@ bool wxSelectionStore::SelectRange(size_t itemFrom, size_t itemTo,
         }
 
         // just add the items to the selection
-        for ( size_t item = itemFrom; item <= itemTo; item++ )
+        for ( unsigned item = itemFrom; item <= itemTo; item++ )
         {
             if ( SelectItem(item, select) && itemsChanged )
             {
@@ -191,7 +191,7 @@ bool wxSelectionStore::SelectRange(size_t itemFrom, size_t itemTo,
 // callbacks
 // ----------------------------------------------------------------------------
 
-void wxSelectionStore::OnItemDelete(size_t item)
+void wxSelectionStore::OnItemDelete(unsigned item)
 {
     size_t count = m_itemsSel.GetCount(),
            i = m_itemsSel.IndexForInsert(item);