private void cmbx_projects_SelectedIndexChanged(object sender, Telerik.WinControls.UI.Data.PositionChangedEventArgs e)
        {
            checkedListBoxWorkers.Items.Clear();
            selectedWorkers.Controls.Clear();
            int         idPprojectSelect = (cmbx_projects.SelectedItem.Tag as Project).ProjectId;
            List <User> workers          = UserRequests.GetWorkerNotInProject(idPprojectSelect);

            if (workers != null)
            {
                checkedListBoxWorkers.DisplayMember = "UserName";
                foreach (User worker in workers)
                {
                    checkedListBoxWorkers.Items.Add(GetItemWorker(worker));
                }
            }
        }