Well, I fixed the issue in my way, I don’t know if is the better way.
At jqx.base.css I added the red css, this is what is missing and scrambling the tree items
.jqx-tree-item-li
{
text-indent: 0;
background-color: transparent;
border: 0px solid transparent;
list-style: none;
left: 100%;
right: 0;
text-align: left;
outline: none;
margin: 0px;
margin-top: 1px;
padding: 0px;
float: none!important;
}