added wxSizer::Get/SetContainingWindow()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40992 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/sizer.tex

@@ -233,6 +233,13 @@ windows which manage it.
 \helpref{wxSizer::SetVirtualSizeHints}{wxsizersetvirtualsizehints}
 
 
+\membersection{wxSizer::GetContainingWindow}\label{wxsizergetcontainingwindow}
+
+\constfunc{wxWindow *}{GetContainingWindow}{\void}
+
+Returns the window this sizer is used in or \NULL if none.
+
+
 \membersection{wxSizer::GetItem}\label{wxsizergetitem}
 
 \func{wxSizerItem *}{GetItem}{\param{wxWindow* }{window}, \param{bool }{recursive = false}}