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    <p>You can add handler to NodeInfo of TreeViewModel of CellTree.</p> <p>Here is example how it is possible to do:</p> <p>First of all let's define what is folder:</p> <pre><code>// the simplest possible folder even without subfolders just to make example working public class Folder { private String name; public Folder(String name) { this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } } </code></pre> <p>Let's say part of your ui.xml is the following:</p> <pre><code>&lt;g:HorizontalPanel&gt; &lt;cellview:CellTree ui:field="folderTree"/&gt; &lt;g:Label ui:field="folderName"/&gt; &lt;/g:HorizontalPanel&gt; </code></pre> <p>Than you have UiBinder:</p> <pre><code>public static interface Binder extends UiBinder&lt;HorizontalPanel, BinderOwner&gt; {} </code></pre> <p>Here is how you define FolerTreeModel that is required for your CellTree:</p> <pre><code>public static class FolderTreeModel implements TreeViewModel { private final ListDataProvider&lt;Folder&gt; dataProvider; private final CellPreviewEvent.Handler&lt;Folder&gt; folderSelectionHandler; public FolderTreeModel(List&lt;Folder&gt; folders, CellPreviewEvent.Handler&lt;Folder&gt; folderSelectionHandler) { this.folderSelectionHandler = folderSelectionHandler; dataProvider = new ListDataProvider&lt;Folder&gt;(folders); } @Override public &lt;T&gt; TreeViewModel.NodeInfo&lt;?&gt; getNodeInfo(T value) { return new DefaultNodeInfo&lt;Folder&gt;(dataProvider, new AbstractCell&lt;Folder&gt;() { // simple renderer that renders folder name @Override public void render(Context context, Folder value, SafeHtmlBuilder sb) { sb.appendEscaped(value.getName()); } }, new SingleSelectionModel&lt;Folder&gt;(), // using single selection model folderSelectionHandler, // add handler to the node info null); // value updater can be null } @Override public boolean isLeaf(Object value) { return false; // I will say that every node is not leaf for simplicity } } </code></pre> <p>And your BinderOwner class:</p> <pre><code>public static class BinderOwner { @UiField(provided = true) CellTree folderTree; @UiField Label folderName; //your other UI element that you will change: show the name of selected folder public BinderOwner() { //List of folders to show something ArrayList&lt;Folder&gt; folders = new ArrayList&lt;Folder&gt;(); folders.add(new Folder("A")); folders.add(new Folder("B")); folders.add(new Folder("C")); // define folder tree folderTree = new CellTree(new FolderTreeModel(folders, new CellPreviewEvent.Handler&lt;Folder&gt;() { // this is your handler @Override public void onCellPreview(CellPreviewEvent&lt;Folder&gt; event) { // set folder name to label on folder selection folderName.setText(event.getValue().getName()); } }), null); } } </code></pre>
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    1. COSo, adding that I can then use something like this on the form? @UiHandler("folderTree") void onTreeCellChange(SelectionChangeEvent e){}
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    2. COYou will not need @UiHandler after that because you will implement it inside onSelectionChange() method.
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    3. COYou have more than one way to add handlers if you use UiBinder. One of them is using @UiHandler annotation for the handler method. This approach is good if GWT creates component for you from UiBinder xml template. Another way is create component manually like you did with @UiField(provided = true). In this case you may add handler during component creation directly in the Java code like in my example.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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