added wxSpinCtrl::SetSelection()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16860 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/spinctrl.h

@@ -59,6 +59,9 @@ public:
     // because the base class already has one returning int!)
     void SetValue(const wxString& text);
 
+    // another wxTextCtrl-like method
+    void SetSelection(long from, long to);
+
     // implementation only from now on
     // -------------------------------