public ExpressionViewer( Composite parent, int style ) {
System.out.println("Expression Viewer");
text = new Text( parent, style );
feedback = new ControlDecoration(text, SWT.TOP | SWT.LEFT);
FunctionFinder ff = new FunctionFinder(null);
proposalProvider = new FunctionContentProposalProvider();
proposalProvider.setFiltering(true);
ContentProposalAdapter adapter = new ContentProposalAdapter(
text, new TextContentAdapter(),