Bug 27491 Cannot add classpath variable to project
build id : 200212020010 The buttons OK and extend... are always disabled in the add variable dialog
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/dialogfields/ListDialogField.java
public Control getListControl(Composite parent) {
		if (fTableControl == null) {
			assertCompositeNotNull(parent);
						
			fTable= createTableViewer(parent);
			fTableControl= (Table)fTable.getControl();
			fTableControl.addKeyListener(new KeyAdapter() {
				public void keyPressed(KeyEvent e) {
					handleKeyPressed(e);
				}
			});
			
			
			TableLayout tableLayout= new TableLayout();
			fTableControl.setLayout(tableLayout);			
			
			if (fTableColumns != null) {
				fTableControl.setHeaderVisible(fTableColumns.headers != null);
				fTableControl.setLinesVisible(fTableColumns.drawLines);
				ColumnLayoutData[] columns= fTableColumns.columns;
				for (int i= 0; i < columns.length; i++) {
					TableColumn column= new TableColumn(fTableControl, SWT.NONE);
					tableLayout.addColumnData(columns[i]);
					if (fTableColumns.headers != null) {
						column.setText(fTableColumns.headers[i]);
					}
				}
			}
			fTable.setContentProvider(fListViewerAdapter);
			fTable.setLabelProvider(fLabelProvider);