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    <p>Unfortunately, IIRC you can't set an id for a Widget in UiBinder's code (I think you can only for normal HTML). So you are left with setting the correct id via <code>someWidget.getElement().setId()</code> (like you did in the code above).</p> <p>What's missing now, I think, is a placeholder (a div, span, whatever) with the correct id in the <code>HTMLPanel referencePanel</code>, like so:</p> <pre><code>&lt;g:HTMLPanel ui:field="referencePanel"&gt; &lt;div ui:field="referencePanelInner" /&gt; &lt;/g:HTMLPanel&gt; </code></pre> <p>And in <code>AppUIDemo</code>:</p> <pre><code>@UiField DivElement referencePanelInner; // ... public AppUIDemo() { // ... referencePanelInner.setId(reference.getRefPanelId()); } </code></pre> <p>...unless you want to add the ReferenceUI directly into <code>referencePanel</code> - in which case you should just use a <code>FlowPanel</code> :)</p> <p>PS: IMHO, you should generate and set the unique id for the <code>ReferenceUI.refPanel</code> from the <code>ReferenceUI</code> class (and expose the id) - that way you don't mess with the widget's "internals" from some external widgets.</p> <hr> <p>OK, I think I got it. The <code>IllegalStateException</code> exception is being thrown because you are adding <code>ReferenceUI.refPanel</code> (or <code>ReferenceUI.referencePanel</code>, I don't know which is the current name) to <code>AppUIDemo</code> (<code>ReferenceUI</code> obviously doesn't implement <code>HasWidgets</code>) - when you should be adding the whole <code>ReferenceUI reference</code> composite :) I don't know why you did it this way in the first place (maybe because of the whole mess with the ids), but the code should look something like this:</p> <pre><code>public AppUIDemo() { initWidget(uiBinder.createAndBindUi(this)); ReferenceUI reference = new ReferenceUI(refUIBinder); referencePanel.add(reference); } </code></pre>
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    1. POHow to combine multiple uiBinder-based widgets?
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    1. USIgor Klimer
    1. USIgor Klimer
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    1. COI changed referencePanel to FlowPanel. The FlowPanel.add() does not take an id argument, just the widget to be added: referencePanel.add(reference); Different error now: java.lang.IllegalStateException: This widget's parent does not implement HasWidgets. Do you know which widget's parent it's unhappy about - innerPanel or referencePanel?
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    2. COIt should point to the line at which the exception occurred - anything? And both `HTMLPanel` and `FlowPanel` of course implement `HasWidgets`, so this would mean that the problem is with your code - could you post the current *.ui.xml files?
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    3. COThe exception points to generated JavaScript code, is where a way to trace it back to Java source?
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