RadDropDownTree client side checkboxes (entries area update)

I am trying to use Telerik's RadDropDownTree control and I have stucked to a problem.

What I want to succeed: I want to select specific nodes (check the checkboxes and update the entries area) from the drop down tree from client side (on 'click' event).

HTML

<telerik:RadDropDownTree 
    runat="server"
    ID="ddtAtfcDepartment"
    Width="500px"
    Skin="MetroTouch"
    EnableFiltering="true"
    DefaultValue="NULL" 
    CheckBoxes="SingleCheck"
    DataTextField="Descr"
    DataFieldID="ID"
    DataValueField="ID"
    DataFieldParentID="ParentID"
    OnClientDropDownOpening="setDdtWidth"                                                         
    AutoPostBack="false">
    <ButtonSettings ShowClear="true" />
    <DropDownSettings
        Width="99%"
        Height="300px"
        CssClass="shiftsFilterSector"
        CloseDropDownOnSelection="false"
        AutoWidth="Enabled" />
    <FilterSettings Highlight="Matches" EmptyMessage="Πληκτρολογήστε για εύρεση" Filter="Contains" />
</telerik:RadDropDownTree>

jQuery

That's how I'm trying to select the nodes in the list. They actually get checked, but the entries area is empty (not selected).

var tree = ddtAtfcDepartment.get_embeddedTree();
var list = [1026,1023]  //The list of values I want to check/select
if (tree && list.length > 0) {                            
    $.each(list, function (i, val) {
        tree.findNodeByValue(val).check();
    });
} 

I've read here that if the checkboxes are enabled, you must use the SyncEmbeddedTree() method to update the entries area, but this is server side method and I am unable to find the corresponding client side method.

Any idea is welcome!