ions are optional for the fit method.
                </td>
            </tr>
            <tr class="collapsible toggle" onclick="toggleTable('methodTable','focus', this);">
                <td colspan="2"><span parent="focus" class="right-caret" id="method_focus"></span> focus(
                    <code>String nodeId</code>,
                    <code>[Object options]</code>)
                </td>
            </tr>
            <tr class="hidden" parent="focus">
                <td class="midMethods">Returns