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
return style;		
	}
	
	protected TableViewer createTableViewer(Composite parent) {
		Table table= new Table(parent, getListStyle());
		return new TableViewer(table);
	}	
	
	protected Button createButton(Composite parent, String label, SelectionListener listener) {
		Button button= new Button(parent, SWT.PUSH);
		button.setText(label);
		button.addSelectionListener(listener);
		GridData gd= new GridData();
		gd.horizontalAlignment= GridData.FILL;
		gd.grabExcessHorizontalSpace= true;
		gd.verticalAlignment= GridData.BEGINNING;
		gd.heightHint = SWTUtil.getButtonHeigthHint(button);
		gd.widthHint = SWTUtil.getButtonWidthHint(button);
	
		button.setLayoutData(gd);
		return button;
	}
	
	private Label createSeparator(Composite parent) {
		Label separator= new Label(parent, SWT.NONE);
		separator.setVisible(false);
		GridData gd= new GridData();
		gd.horizontalAlignment= GridData.FILL;
		gd.verticalAlignment= GridData.BEGINNING;
		gd.heightHint= 4;