Nesting Tiles definitions

I would like to nest tiles, but have found that doing this in-line does not
work. Please see example below and work around as follows:

Is there a better way to achieve the following?

HTML Generated
==============

<table>
<tr>
      <td>Outer</td>
</tr>
      <td>Inner</td>
      <td>...Content</td>
</tr>
</table>


JSP In-line
===========
<tiles:insert page="panel.jsp">
      <tiles:put name="panelTitle" value="Outer" />
      <tiles:put name="content" direct="true">
            <tiles:insert page="panel.jsp">
                  <tiles:put name="panelTitle" value="Inner Title" />
                        ..Content
                  </tiles:put>
            </tiles:insert>
      </tiles:put>
</tiles:insert>

panel.jsp
=========
<table>
<tr>
      <td><tiles:getAsString name="panelTitle"/></td>
</tr>
<tr>
      <td>
            <tiles:insert attribute="content"/>
      </td>
</tr>
</table>

Work around
===========
<tiles:definition id="inner" page="panel.jsp">
      <tiles:put name="panelTitle" value="Inner" />
      <tiles:put name="content" direct="true">
            ...content
      </tiles:put>
</tiles:definition>

<tiles:insert page="panel.jsp">
      <tiles:put name="panelTitle" value="Outer" />
      <tiles:put name="content" beanName="Inner"/>
</tiles:insert>

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