how to get on mouse over on tree

i want to get on mouser functionality for tool tip .
Please give suggestion

I think you need to use :
(and call a third-party js like the mentioned in the posts below)
tree.onItemMouseOver = function( row){
var text = "tooltip: " + this.getItemText( row);
Tip(text);
}

tree.onItemMouseOut = function(){
UnTip();
}

http://www.activewidgets.com/javascript.forum.24656.11/using-grid-with-walter-zorn.html
http://www.activewidgets.com/javascript.forum.1742.5/multi-line-tooltip.html
HTH