.treegrid-indent {width:21px; height: 21px; display: inline-block; position: relative;}

.treegrid-expander {width:21px; height: 21px; display: inline-block; position: relative; cursor: pointer; top: 2px;}

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