final TabSheet tabs = new TabSheet();
tabs.addTab(new Label("Content 1"), "Content 1", null);
tabs.addTab(new Label("Content 2"), "Content 2", null);
tabs.addTab(new Label("Content 3"), "Content 3", null);
tabs.addTab(new Label("Content 4"), "Content 4", null);
tabs.addTab(new Label("Content 5"), "Content 5", null);
addComponent(tabs);
Button replace2 = new Button("Replace Content 2",
new Button.ClickListener() {