Create a tree table starting with the second level

I need to create tree table in sapui5 starting with the second level. Is it possible. If so, how can I do that?
That's how it looks now:
<m:content> <TreeTableid="treeTable"selectionMode="Single"enableColumnReordering="false"enableSelectAll="false"expandFirstLevel="false"rows="{path:'objLib>/Objectives', parameters: {arrayNames:['children']}}">