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Use setItemStyle(itemId,style_string) to set individual item style, where style_string is valid CSS string.

For example:

fatList = tree.getAllFatItems();

fatArray = fatList.split(',');

   for(var i = 0; i < fatArray.length; i++){

    if(tree.getLevel(fatArray[i])==1)

          tree.setItemStyle( fatArray[i],"color: red") }

 Also next trick can be used

 .containerTableStyle table table .standartTreeRow {

            //first level in  tree

}

.containerTableStyle table table table .standartTreeRow {

            //second level in tree

}

.containerTableStyle table table table table .standartTreeRow {

            //third level in tree

Not much can be said in addition to the reply above, but you also can check rich web application framework and editable table ajax and find out what we have probably missed in our explanation.