.treegrid-indent {width:16px; height: 16px; display: inline-block; position: relative;}

.treegrid-expander {width:16px; height: 16px; display: inline-block; position: relative; cursor: pointer;}

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