   <td>expanderTemplate</td>
                    <td>String</td>
                    <td>&lt;span class="treegrid-expander"&gt;&lt;/span&gt;</td>
                    <td>HTML Element when you click on that will be collapse/expand branches</td>
                </tr>
                <tr>
                    <td>expanderExpandedClass</td>
                    <td>String</td>
                    <td>treegrid-expander-expanded</td>
                    <td>Class using for expander element when it expanded</td>
   