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<head><title>Class hierarchy</title></head>
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<H2>Class hierarchy</H2>
<P>
The class hierarchy has changed somewhat. wxToolBar and wxButtonBar
classes have been split into several classes, and are derived from wxControl (which was
called wxItem). wxPanel derives from wxWindow instead of from wxCanvas, which has
disappeared in favour of wxScrolledWindow (since all windows are now effectively canvases
which can be drawn into). The status bar has become a class in its own right, wxStatusBar.<P>
There are new MDI classes so that wxFrame does not have to be overloaded with this
functionality.<P>
There are new device context classes, with wxPanelDC and wxCanvasDC disappearing.
See <A HREF="port9.htm#dc">Device contexts and painting</A>.<P>
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