Currently treeview calls transport read method when we first time click on expand. After that the data is cached.
I want to call read method forcefully so that dynamically added nodes are refreshed in tree.
Is there a way to give a serverside read call on every expand button click?

the below code can help you..

please have this in the node expand event.

$("#treeview").kendoTreeView({
             dataSource: Categories,             
             expand: onExpand,
            dataTextField: ["Name", "Name"]            
        });
 
function onExpand(e) {
            $("[data-role=treeview]").data("kendoTreeView")
        .bind("expand", function (e) {
            this.dataItem(e.node).loaded(false);
        })
        .bind("collapse", function (e) {
            setTimeout(function () {
                $(e.node).children(".k-group,.k-animation-container").remove();
            }, this.options.animation.collapse.duration);
        })
    }

this still doesn't work. The reason being, tree view caches data by default. So when you click on subsequest expand, it loads tree from cache.
I added cache: false attribute on transport read method for tree view and now it does a server call for every expand.

transport: {
                read: {
                    url: document.URL + "/GetOrgUnitTree/",
                    dataType: "json",
                    cache: false
                }

Thanks,
Sushant