private void RadGridView1_FilterPopupInitialized(object sender, FilterPopupInitializedEventArgs e)
 {
     RadListFilterPopup popup = e.FilterPopup as RadListFilterPopup;
     if (popup != null)
     {
         popup.Tag = e.Column.Name;
         popup.PopupOpened -= popup_PopupOpened;
         popup.PopupOpened += popup_PopupOpened;
     }
 }
 private void popup_PopupOpened(object sender, EventArgs args)
 {
     RadListFilterPopup popup = sender as RadListFilterPopup;

     foreach (GridViewRowInfo row in this.radGridView1.ChildRows)
     {
         RadTreeNode node = popup.MenuTreeElement.TreeView.FindNodes(row.Cells[popup.Tag + ""].Value.ToString()).FirstOrDefault();
         if (node != null)
         {
             node.Checked = true;
         }
     }
 }