.treegrid-indent {width:13px; height: 13px; display: inline-block; position: relative;}

.treegrid-expander {width:13px; height: 13px; display: inline-block; position: relative; cursor: pointer;}

.treegrid-expander-expanded{background-image: url(../images/collapse.png); }
.treegrid-expander-collapsed{background-image: url(../images/expand.png);}