I have a GWT tab panel and would like to reload a single tab when a certain event (e.g. button click) happens in another tab. Is there a way to do that? Another possibility would be executing some code (e.g. adding a new element to a tab) when that tab is selected. Any help would be really appreciated, I am stuck with this for a while already.

To make the question more specific I am providing some code below.

I have my code organized in screens, there is a home screen that initiates the tab panel. And there are separate screens for initiation of each tab.

The simplified code for the home screen:

    public class HomeScreen extends Composite{

  public HomeScreen()    {

    TabPanel tabPanel = new TabPanel();
    FlowPanel flowpanel;

    flowpanel = new FlowPanel();
    ProfileTabScreen profileTabScreen = new ProfileTabScreen();
    flowpanel.add(profileTabScreen);
    tabPanel.add(flowpanel, "Profile");

    flowpanel = new FlowPanel();
    GroupsTabScreen groupsTabScreen = new GroupsTabScreen();
    flowpanel.add(groupsTabScreen);
    tabPanel.add(flowpanel, "Groups");

    initWidget(tabPanel);
  }
    }

Code for the tab screen from which I want to initiate the reload:

    private VerticalPanel groupPanel = new VerticalPanel();
private Button newGroupButton = new Button("New group");

    public GroupsTabScreen()    {       

    newGroupButton.addClickHandler(new ClickHandler(){
        public void onClick(ClickEvent event) { 
            createNewGroup();
        }
    });

            groupPanel.add(newGroupButton);

    initWidget(groupPanel);
}

Code for the tab screen that has to be reloaded:

    private VerticalPanel profilePanel = new VerticalPanel();
private Label label = new Label("No groups yet.");

    public ProfileTabScreen()    {      

            profilePanel.add(label);
    initWidget(profilePanel);
}

So let's imagine I just want to change text of a label in profileTab (while in reality it will be ListBox and other elements), when the newGroupButton is clicked in groupTab.

As I said, reloading the whole profileTab each time is is selected would be acceptable as well.