Began docs on sizers,

Correted a few other docs


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3388 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/sizer.tex

@@ -1,22 +1,30 @@
-%
-% automatically generated by HelpGen from
-% include\wx\sizer.h at 13/Aug/99 22:27:59
-%
-
-
 \section{\class{wxSizer}}\label{wxsizer}
 
+wxSizer is the abstract base class used for layouting subwindows in a window. You
+cannot use wxSizer directly; instead, you'll have to use \helpref{wxBoxSizer}{wxboxsizer}
+or \helpref{wxStaticBoxSizer}{wxstaticboxsizer}.
 
+The layouting algorithm used by sizers in wxWindows closely related to layouting
+in other GUI toolkits, such as Java's AWT, the GTK toolkit or the Qt toolkit. It is
+based upon the idea of the individual subwindows reporting their minimal required
+size and their ability to get stretched if the size of the parent window has changed.
+This will most often mean, that the programmer does not set the original size of
+the dialog in the beginning, rather the top-most sizer will get queried and it will 
+then query its children. Its children can be normal windows or other sizers, so that
+a hierachy of sizer can be constructed. Note that sizer are not derived from wxWindows
+and thus do not interfere with tab ordering and require very little resources compared
+to a real window on screen.
 
-wxSizer
-
+What makes sizers so well fitted for use in wxWindows, is the fact that every control
+reports its own minimal size and the algorithm can handle differences in font sizes
+or different window (dialog item) sizes on different platforms without problems. If e.g.
+the standard font as well as the overall design of Motif widgets requires more space than
+on Windows, the intial dialog size will automatically be bigger on Motif than on Windows.
 
 \wxheading{Derived from}
 
 \helpref{wxObject}{wxobject}
 
-\wxheading{Data structures}
-
 \latexignore{\rtfignore{\wxheading{Members}}}