The Google Web Toolkit documentation has been updated with the latest (for now, 2.5) version. As you said, UiBinder has new improvements.
According to the Google blog post What’s new in GWT 2.5:
GWT 2.5 adds extensions to UiBinder that allow it to support Cell rendering and event handling. In particular, this design enables UiBinder to generate a UiRenderer implementation to assist with rendering SafeHtml, and dispatching events to methods specified by @UiHandler tags. See Rendering HTML for Cells for more information.
We’ve also introduced the IsRenderable/RenderablePanel types. When used by an application instead of HTMLPanel, they can significantly improve rendering time and reduce the latency of complex UiBinder UIs.
The documentation shows multiple examples about that feature in 2.5. You can see the examples here: Rendering HTML for Cells.
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solved Sample GWT2.5 application [closed]