final Column[] columns = {
new Column(0, false, checkAll, "20", new CheckBoxRenderer()),
new Column(1, true, "Text (StringRenderer)", "10%"),
new Column(2, false, "Date (StringRenderer)", "10%"),
new Column(3, false, "Number (StringRenderer)", "10%"),
new Column(4, true, "Date (DateTimeRenderer)", "10%", new DateTimeRenderer(DateTimeFormat.getFormat("yyyy-MM-dd"))),
new Column(5, true, "Number (NumberRenderer)", "10%", new NumberRenderer(NumberFormat.getDecimalFormat())),
new Column(6, false, "(ListBoxRenderer)", "10%", new ListBoxRenderer(new String[] { "One", "Two", "Three" },
"Select an item")),
new Column(7, false, "(ButtonRenderer)", "10%", new ButtonRenderer("Click here")),
new Column(8, false, "(TextBoxRenderer)", "10%", new TextBoxRenderer(50, 5, "Enter your message")),