or
// with clear value option var timeOnlyColumn = new GridViewDateTimeColumn { HeaderText = "Time in", Name = Data.cJobCardData.JobCardColumns.DateTimeIn, FieldName = Data.cJobCardData.JobCardColumns.DateTimeIn, Format = DateTimePickerFormat.Time, EditorType = GridViewDateTimeEditorType.TimePicker, FormatString = "{0: h:mm tt}", TextAlignment = ContentAlignment.MiddleCenter, Width = colWidth };// No clear value option var dateColumnIn = new GridViewDateTimeColumn { HeaderText = "Date Time In", Name = Data.cJobCardData.JobCardColumns.DateTimeIn, FieldName = Data.cJobCardData.JobCardColumns.DateTimeIn, Format = DateTimePickerFormat.Long, EditorType = GridViewDateTimeEditorType.TimePicker, FormatString = "{0: M/d/yyyy h:mm tt}", TextAlignment = ContentAlignment.MiddleCenter, Width = colWidth };


public partial class Form1 : Form { BindingList<Thing> RootChildren; int currentId = 1; public Form1() { InitializeComponent(); } private void buttonLoad_Click(object sender, EventArgs e) { radTreeView1.DataSource = null; RootChildren = new BindingList<Thing>(); Thing t1 = new Thing(1, "One"); Thing t2 = new Thing(2, "Two"); Thing t3 = new Thing(3, "Three"); Thing t4 = new Thing(4, "Four"); currentId = 5; RootChildren.Add(t1); RootChildren.Add(t2); RootChildren.Add(t3); RootChildren.Add(t4); radTreeView1.DataSource = RootChildren; radTreeView1.ChildMember = @"Children\Children\Children\Children"; radTreeView1.ValueMember = "Id"; radTreeView1.DisplayMember = "Name"; } private void buttonClear_Click(object sender, EventArgs e) { radTreeView1.DataSource = null; } private void buttonAdd_Click(object sender, EventArgs e) { Thing thing = new Thing(currentId, "NewThing" + currentId); RootChildren.Add(thing); currentId++; RootChildren.ResetBindings(); } } public class Thing { public int Id { get; set; } public string Name { get; set; } public BindingList<Thing> Children = new BindingList<Thing>(); public Thing() { } public Thing(int id, string name) { Id = id; Name = name; } }