[Gui4j-user] refresh tree

[Linu H. <lin...@ya...>]

Hello
I am having some troubles with the graphic appearence of a tree.
Each node is populated by a list
 When trying to add a new node from a menu command, i add an Object to a list and also i fire an event.
Then i add the refresh element to the tree ,and add an event to be aware, like here

<tree root="getTreeRoot" guiId="tree" refresh="{eSwitch}">
        <node value="'Root'" contentType="Root"
            onSelect="actionSelectRoot(?item)"
            children="getChildrenOfRoot(?item)" />
     ...
        <node value="?item.getNodeText" contentType="Project"
            onSelect="actionSelectPrj(?item)" children="?item.getChildren" />
        ...
    </tree>  

>From the menu i call the newPrj function of the controller like this
<menuBar guiId="menuBar">
        <menu text="'File'">
            <menu text="'New'">
                 <menuItem text = "'Project'" actionCommand = "newPrj"></menuItem>
and newPrj function triggers an event after adding another element to the project list 

public void addPrj() {
        Project p = new Project("New Project");
        prjList.add(p);
        p.setChildren(prjList);
        eSwitch.fireEvent();
    }
I can see the list is added a new element,but no graphic node is "drawn" in the tree, even if i call refresh attribute of the tree. What do i do wrong?
Thank you