private void buttonSelectAllProjects_Click(object sender, RoutedEventArgs e)
 {
     LbProjects.SelectAll();
     //foreach (ListBoxItem item in LbProjects.Items)
     //{
     //    item.IsSelected = !item.IsSelected;
     //}
 }
        private void ButtonMeOnly_OnClick(object sender, RoutedEventArgs e)
        {
            LbProjects.SelectedItems.Clear();
            LbProjects.SelectAll();

            foreach (object item in LbUsers.Items)
            {
                if (((TpUser)item).Login == Settings.Default.Login)
                {
                    LbUsers.SelectedItems.Add((item));
                    LbUsers.ScrollIntoView(item);
                }
            }
        }