Please note that swt usage questions
like this should be asked on the eclipse.platform.swt newsgroup, not on
this mailing list.
You need to:
- listen for a selection event on the
Tree, see http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet114.java?view=co
- when an event is received, make whatever
state change is needed to make your Canvas's Paint listener draw its new
content, and then use Canvas.redraw(...) to do the update, see http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet275.java?view=co