for each document), or single-window (one document open at a time, as in Windows Write).
\item Use the appropriate wxDocParentFrame and wxDocChildFrame classes. Construct an instance
of wxDocParentFrame in your wxApp::OnInit, and a wxDocChildFrame (if not single-window) when
for each document), or single-window (one document open at a time, as in Windows Write).
\item Use the appropriate wxDocParentFrame and wxDocChildFrame classes. Construct an instance
of wxDocParentFrame in your wxApp::OnInit, and a wxDocChildFrame (if not single-window) when