Added 'Include files' section to class references

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1698 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/prevwin.tex

@@ -1,4 +1,3 @@
-
 \section{\class{wxPreviewCanvas}}\label{wxpreviewcanvas}
 
 A preview canvas is the default canvas used by the print preview
@@ -11,6 +10,10 @@ system to display the preview.
 \helpref{wxevthandler}{wxevthandler}\\
 \helpref{wxObject}{wxobject}
 
+\wxheading{Include files}
+
+<wx/print.h>
+
 \wxheading{See also}
 
 \helpref{wxPreviewFrame}{wxpreviewframe}, \helpref{wxPreviewControlBar}{wxpreviewcontrolbar},\rtfsp
@@ -52,6 +55,10 @@ or you can leave it as it is.
 \helpref{wxEvtHandler}{wxevthandler}\\
 \helpref{wxObject}{wxobject}
 
+\wxheading{Include files}
+
+<wx/print.h>
+
 \wxheading{See also}
 
 \helpref{wxPreviewFrame}{wxpreviewframe}, \helpref{wxPreviewCanvas}{wxpreviewcanvas},\rtfsp
@@ -121,6 +128,10 @@ class may be used without derivation.
 \helpref{wxEvtHandler}{wxevthandler}\\
 \helpref{wxObject}{wxobject}
 
+\wxheading{Include files}
+
+<wx/print.h>
+
 \wxheading{See also}
 
 \helpref{wxPreviewCanvas}{wxpreviewcanvas}, \helpref{wxPreviewControlBar}{wxpreviewcontrolbar},\rtfsp