Order by checked in the drop down

        public RadForm1()
        {
            InitializeComponent();

            for (int i = 0; i < 20; i++)
            {
                ListViewDataItem item = new ListViewDataItem(); 
                item.Text = "Item" + i;
                this.radCheckedListBox1.Items.Add(item);
            }
        }

        private void radButton1_Click(object sender, EventArgs e)
        {
            radCheckedListBox1.EnableSorting = true;
            SortDescriptor sort = new SortDescriptor("Checked", ListSortDirection.Ascending);
            this.radCheckedListBox1.ListViewElement.DataView.Comparer = new ListViewCustomComparer(this.radCheckedListBox1.ListViewElement);
            radCheckedListBox1.SortDescriptors.Add(sort);
        }

        public class ListViewCustomComparer : IComparer<ListViewDataItem>
        {
            RadListViewElement listViewElement;

            public ListViewCustomComparer(RadListViewElement listViewElement)
            {
                this.listViewElement = listViewElement;
            }

            public int Compare(ListViewDataItem x, ListViewDataItem y)
            {
                ToggleState xToggle = x.CheckState;
                ToggleState yToggle = y.CheckState;
                if (xToggle == ToggleState.On)
                {
                    if (yToggle== ToggleState.On)
                    {
                        return x.Text.CompareTo(y.Text);
                    }
                    return 0;
                }
                else if (yToggle== ToggleState.On)
                {
                    return 1;
                }
                else
                {
                    return 0;
                }
            }
        }