Getting Selected Library Id from Telerik.Sitefinity.Web.UI.F

Trying to save a library Id in a widget. Following is the control and its settings:

            <sitefinity:FolderSelector ID="ItemSelector" runat="server"
                AllowMultipleSelection="false"
WebServiceUrl="~/Sitefinity/Services/Content/DocumentLibraryService.svc/folders/"
                ShowIncludeChildLibraryItems="true"
                BindOnLoad="true">
            </sitefinity:FolderSelector>

this.get_ItemSelector(); returns the html of the selector and not the Teleril library object.

get_ItemSelector: function ()
        return this._itemSelector;
    ,