Allow setting colours and font of wxTreeListCtrl.

Use wxCompositeWindow<> to propagate changes of colours and font to
wxDataViewCtrl that wxTreeListCtrl uses internally.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69028 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/treelist.cpp

@@ -1022,6 +1022,13 @@ wxTreeListCtrl::~wxTreeListCtrl()
         m_model->DecRef();
 }
 
+wxWindowList wxTreeListCtrl::GetCompositeWindowParts() const
+{
+    wxWindowList parts;
+    parts.push_back(m_view);
+    return parts;
+}
+
 // ----------------------------------------------------------------------------
 // Columns
 // ----------------------------------------------------------------------------