I have tried stepping through the code in debug mode and found that the code indeed updates the TextBox. But the new value just doesn't show up in the UI.
I am pretty sure the above code works as expected when creating a demo project. So I guess you have a bug in your code that you have not shown here.
The most simple bug that can cause this issue is assigning a new instance of TextBox to the @UiField annotated field messageTextBox after initWidget() has been called. The new instance is not attached to the DOM and thus you won't see the updated text.
-- J.
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