added wxTextEntry::SetHint() (a.k.a. cue banner or placeholder string)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59263 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/combobox.h

@@ -166,6 +166,9 @@ protected:
     wxListBox *GetLBox() const { return m_lbox; }
 
 private:
+    // implement wxTextEntry pure virtual method
+    virtual wxWindow *GetEditableWindow() { return this; }
+
     // the popup listbox
     wxListBox *m_lbox;