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    <p>I'll start with the fix, then move on to explain it afterward.</p> <h1>Fixing the problem</h1> <p>The easiest way to fix this problem is as follows. Here's your code:</p> <pre><code>HTMLPanel innerPanel = reference.getRefPanel(); innerPanel.getElement().setId(HTMLPanel.createUniqueId()); referencePanel.add(innerPanel); </code></pre> <p>Replace that with the following code. Note that only the last line has changed.</p> <pre><code>HTMLPanel innerPanel = reference.getRefPanel(); innerPanel.getElement().setId(HTMLPanel.createUniqueId()); referencePanel.add(reference); </code></pre> <p>This way, you are adding the <code>Composite</code> object. There will be no difference to the user, as the <code>HTMLPanel</code> (your <code>innerPanel</code>) will be directly attached into the document.</p> <hr> <h1>Some background</h1> <h2>Adding a widget to a complex panel</h2> <p>When you add a widget to a complex panel (a panel that holds more than one child widget), four things happen one after the other:</p> <ol> <li><strong>The widget is told to remove itself from its current parent</strong></li> <li>The panel adds the widget to its list of children</li> <li>The panel adds the widget to the document</li> <li>The widget is told to set the panel as its new parent</li> </ol> <h2>Telling a widget to remove itself from its parent</h2> <p>When a child is told to remove itself from its parent, one of the following occurs:</p> <ul> <li>If the widget does not have a parent, it does nothing</li> <li>If the widget is the child of a panel that implements <code>HasWidgets</code>, the widget tells the panel to remove that widget</li> <li><strong>Otherwise, the widget throws <code>IllegalStateException</code> with message "This widget's parent does not implement HasWidgets</strong></li> </ul> <h2>Composite widgets</h2> <p>When calling <code>initWidget(Widget)</code>, the widget's parent is set to the <code>Composite</code> object.</p> <h1>The problem</h1> <p>When you try to add <code>innerPanel</code>, it is told to remove itself from its current parent. <code>innerPanel</code> is actually the root of your UiBinder template. Its parent is a <code>Composite</code> object (specifically, <code>ReferenceUI</code>). This results in the exception being thrown, as <code>Composite</code> does not implement <code>HasWidgets</code> and does not support removing its widget.</p>
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    1. POHow to combine multiple uiBinder-based widgets?
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    1. USWesley
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    1. POHow to combine multiple uiBinder-based widgets?
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    1. CO+1 Nice, you got it right - I actually edited my answer before reading yours and it turns out that I basically wrote the same thing >_< (only in a less organized way ;))
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      1. USIgor Klimer
    2. COthank you very much, for a working answer, and detailed explanation.
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      1. USjprusakova
    3. COGlad it worked, jprusakova. And upvoted your answer Igor - it seems that great minds think alike!
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