support Show() in wxFlexGridSizer (patch 737850)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21308 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/sizer.tex

@@ -309,3 +309,5 @@ minimal size. For windows with managed scrollbars this will set them appropriate
 Shows or hides the {\it window}, {\it sizer}, or item at {\it index}.
 To make a sizer item disappear or reappear, use Show() followed by Layout().
 
+Note that this only works with wxBoxSizer and wxFlexGridSizer, since they
+are the only two sizer classes that can size rows/columns independently.

docs/latex/wx/tsizer.tex

@@ -113,6 +113,21 @@ initial width:
 
 Within wxDesigner, this stretch factor gets set from the {\it Option} menu.
 
+\subsubsection{Hiding controls using sizers}\label{sizershiding}
+
+You can hide controls contained in sizers the same way you would hide any control,
+using the \helpref{wxWindow::Show}{wxwindowshow} method.
+
+However, wxSizer also offers a separate method which can tell the sizer not to 
+consider that control in its size calculations.  To hide a window using the sizer,
+call \helpref{wxSizer::Show}{wxsizershow}.  You must then call Layout on the sizer 
+to force an update.
+
+This is useful when hiding parts of the interface, since you can avoid removing
+the controls from the sizer and having to add them back later.
+
+Note: This is supported only by wxBoxSizer and wxFlexGridSizer.
+
 \wxheading{wxBoxSizer}
 
 \helpref{wxBoxSizer}{wxboxsizer} can lay out its children either vertically