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Also is it possible to have some small animation, when user clicks plus sign(+) on the tree? When user clicks...

Also is it possible to have some small animation, when user clicks plus sign(+) on the tree? When user clicks it I go to server side, take data and return string which consist of IDs and text for each node. It takes some time, so I would like that user have impression, that something is going on when he/she clicks plus.

In order to change node icon and get it shown before server side completed you need to send request to server in another thread, like this:

function toCallOnSelect(nodeId){

      tree.setNodeIconOrWhatever(…)//change icon here

      window.setTimeout(toSendRequestToServer,10);          

}

function toSendRequestToServer(){

}

Moving server request into another thread with setTimeout gives the ability to browser to draw changed icon.