added wxWindow::IsFrozen() (only existed in wxMSW and wxDFB before)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41207 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/window.tex

@@ -1529,6 +1529,18 @@ implements the following methods:\par
 \end{twocollist}}}
 
 
+\membersection{wxWindow::IsFrozen}\label{wxwindowisfrozen}
+
+\constfunc{virtual bool}{IsFrozen}{\void}
+
+Returns \true if the window is currently frozen by a call to 
+\helpref{Freeze()}{wxwindowfreeze}.
+
+\wxheading{See also}
+
+\helpref{Thaw()}{wxwindowthaw}
+
+
 \membersection{wxWindow::IsRetained}\label{wxwindowisretained}
 
 \constfunc{virtual bool}{IsRetained}{\void}