made wxFrame::SendSizeEvent() public and documented it

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16679 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/frame.h

@@ -71,6 +71,13 @@ public:
     // if the frame has a toolbar) in client coordinates
     virtual wxPoint GetClientAreaOrigin() const;
 
+    // sends a size event to the window using its current size -- this has an
+    // effect of refreshing the window layout
+    //
+    // currently it is only implemented under MSW but is declared here to make
+    // it possible to call it in portable code without using #ifdef's
+    virtual void SendSizeEvent() { }
+
     // menu bar functions
     // ------------------