Added wxNB_FLAT for WinCE property sheet tabs

Titlebar OK button on PocketPC now looks for OK, Cancel, Close buttons.
Dialog size now takes into account SIP or menubar.
Panels more naturally white on PocketPC.
wxDIALOG_EX_CONTEXTHELP ignored on WinCE since it interferes
with correct titlebar style.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32800 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/dialog.tex

@@ -81,6 +81,7 @@ style to prevent this from happening and create an orphan dialog. This is not re
 caption. When pressed, Windows will go into a context-sensitive help mode and wxWidgets will send
 a wxEVT\_HELP event if the user clicked on an application window. {\it Note}\ that this is an extended
 style and must be set by calling \helpref{SetExtraStyle}{wxwindowsetextrastyle} before Create is called (two-step construction).}
+\twocolitem{\windowstyle{wxDIALOG\_EX\_METAL}}{On Mac OS X, frames with this style will be shown with a metallic look. This is an {\it extra} style.}
 \end{twocollist}
 
 Under Unix or Linux, MWM (the Motif Window Manager) or other window managers