public partial class TestForm: Form
	{
		private readonly DataView _view;

		public TestForm()
		{
			InitializeComponent();

			_view = new DataView(LoadTable(true));
			_grid.ColumnCount = _view.Table.Columns.Count;
			_grid.RowCount = _view.Count;
			_grid.AllowAddNewRow = true;
			_grid.SelectionMode = VirtualGridSelectionMode.FullRowSelect;
		}

		static private DataTable LoadTable(bool fill)
		{
			var table = new DataTable();
			table.Columns.Add("Number", typeof(int));
			
			if (fill)
				for(int i = 0; i < 20; i++)
					table.Rows.Add(i);
			
			return table;
		}


		#region Windows Form Designer generated code

		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this._grid = new Telerik.WinControls.UI.RadVirtualGrid();
			((System.ComponentModel.ISupportInitialize)(this._grid)).BeginInit();
			this.SuspendLayout();
			// 
			// _grid
			// 
			this._grid.Dock = System.Windows.Forms.DockStyle.Fill;
			this._grid.Location = new System.Drawing.Point(0, 0);
			this._grid.MultiSelect = true;
			this._grid.Name = "_grid";
			this._grid.SelectionMode = Telerik.WinControls.UI.VirtualGridSelectionMode.FullRowSelect;
			this._grid.Size = new System.Drawing.Size(800, 450);
			this._grid.TabIndex = 0;
			this._grid.CellValueNeeded += new Telerik.WinControls.UI.VirtualGridCellValueNeededEventHandler(this._grid_CellValueNeeded);
			this._grid.UserDeletedRow += new Telerik.WinControls.UI.VirtualGridRowsEventHandler(this._grid_UserDeletedRow);
			// 
			// TestForm
			// 
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.ClientSize = new System.Drawing.Size(800, 450);
			this.Controls.Add(this._grid);
			this.Name = "TestForm";
			this.Text = "TestForm";
			((System.ComponentModel.ISupportInitialize)(this._grid)).EndInit();
			this.ResumeLayout(false);

		}

		#endregion

		private Telerik.WinControls.UI.RadVirtualGrid _grid;

		private void _grid_CellValueNeeded(object sender, Telerik.WinControls.UI.VirtualGridCellValueNeededEventArgs e)
		{
			if (e.ColumnIndex < 0)
				return;

			if (e.RowIndex < 0)
			{
				e.FieldName = _view.Table.Columns[e.ColumnIndex].ColumnName;
				if (e.RowIndex == RadVirtualGrid.HeaderRowIndex)
					e.Value = e.FieldName;
			}
			else if (e.RowIndex < _view.Count)
			{
				e.Value = _view[e.RowIndex][e.ColumnIndex];
			}
		}

		private void _grid_UserDeletedRow(object sender, Telerik.WinControls.UI.VirtualGridRowsEventArgs e)
		{
			var rowIndexes = e.RowIndices.Distinct().OrderByDescending(i => i).ToList(); // Off topic: I have seen duplicate row indexes in this row collection. And unsorted. Is that by design?
			if (rowIndexes.Count == _view.Count)
			{
				_view.Table.Rows.Clear();
			}
			else
			{
				foreach(var index in rowIndexes)
					_view[index].Delete();
			}

			_grid.RowCount = _view.Count;
		}
	}

public void CopyToClipboard(
      int startRow,
      int startColumn,
      int endRow,
      int endColumn,
      VirtualGridViewInfo viewInfo,
      bool selectedOnly,
      bool cut)
    {
      DataObject dataObject = new DataObject();
      string data1 = this.ProcessContent(DataFormats.Text, startRow, startColumn, endRow, endColumn, viewInfo, selectedOnly, cut);
      dataObject.SetData(DataFormats.UnicodeText, false, (object) data1);
      VirtualGridClipboardEventArgs args1 = new VirtualGridClipboardEventArgs(false, DataFormats.UnicodeText, dataObject, this.CurrentCell.ViewInfo);
      this.OnCopying(args1);
      if (args1.Cancel)
        return;
      dataObject.SetData(DataFormats.Text, false, (object) data1);
      VirtualGridClipboardEventArgs args2 = new VirtualGridClipboardEventArgs(false, DataFormats.Text, dataObject, this.CurrentCell.ViewInfo);
      this.OnCopying(args2);
      if (args2.Cancel)
        return;
      string data2 = this.ProcessContent(DataFormats.CommaSeparatedValue, startRow, startColumn, endRow, endColumn, viewInfo, selectedOnly, cut);
      dataObject.SetData(DataFormats.CommaSeparatedValue, false, (object) data2);
      VirtualGridClipboardEventArgs args3 = new VirtualGridClipboardEventArgs(false, DataFormats.CommaSeparatedValue, dataObject, this.CurrentCell.ViewInfo);
      this.OnCopying(args3);
      if (args3.Cancel)
        return;
      Clipboard.SetDataObject((object) dataObject);
    }

public void CopyToClipboard(
	int startRow,
	int startColumn,
	int endRow,
	int endColumn,
	VirtualGridViewInfo viewInfo,
	bool selectedOnly,
	bool cut)
{
	DataObject dataObject = new DataObject();

	VirtualGridClipboardEventArgs eventArgs = new VirtualGridClipboardEventArgs(false, DataFormats.UnicodeText, dataObject, CurrentCell.ViewInfo);
	OnCopying(eventArgs);
	bool useText = !eventArgs.Cancel;
	
	eventArgs = new VirtualGridClipboardEventArgs(false, DataFormats.UnicodeText, dataObject, CurrentCell.ViewInfo);
	OnCopying(eventArgs);
	bool useUnicodeText = !eventArgs.Cancel;

	if (useText || useUnicodeText)
	{
		string text = __instance.ProcessContent(DataFormats.Text, startRow, startColumn, endRow, endColumn, viewInfo, cut);
		if (useText)
			dataObject.SetData(DataFormats.Text, false, text);
		if (useUnicodeText)
			dataObject.SetData(DataFormats.UnicodeText, false, text);
	}
	eventArgs = new VirtualGridClipboardEventArgs(false, DataFormats.Text, dataObject, CurrentCell.ViewInfo);
	OnCopying(eventArgs);
	if (!eventArgs.Cancel)
	{
		string csv = __instance.ProcessContent(DataFormats.CommaSeparatedValue, startRow, startColumn, endRow, endColumn, viewInfo, selectedOnly, cut);
		dataObject.SetData(DataFormats.CommaSeparatedValue, false, csv);
	}
	
	if (dataObject.GetFormats().Length > 0)
		Clipboard.SetDataObject(dataObject);
}

RadVirtualGrid grid = new RadVirtualGrid();
var hasSelection1 = grid.Selection.HasSelection; 
_grid.Selection.ClearSelection();
var hasSelection2 = grid.Selection.HasSelection;

Message             : Object reference not set to an instance of an object.
Type                : System.NullReferenceException
Source              : Telerik.WinControls.GridView
Stack trace         : Telerik.WinControls.UI.RadVirtualGridElement.CopyToClipboard(Int32 startRow, Int32 startColumn, Int32 endRow, Int32 endColumn, VirtualGridViewInfo viewInfo, Boolean selectedOnly, Boolean cut)
                      Telerik.WinControls.UI.RadVirtualGridElement.CopySelection()
                      Turien.Windows.Forms.Telerik.VirtualGrid.VirtualGridViewPlus.RadVirtualGridElementPlus.CopySelection()
                      Turien.Windows.Forms.Telerik.VirtualGrid.VirtualGridViewPlus.VirtualGridInputBehaviorPlus.HandleUnhandledKeys(KeyEventArgs keys)
                      Telerik.WinControls.UI.VirtualGridInputBehavior.HandleKeyDown(KeyEventArgs args)
                      Telerik.WinControls.UI.RadVirtualGrid.OnKeyDown(KeyEventArgs e)
                      System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
                      System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
                      System.Windows.Forms.Control.WmKeyChar(Message& m)
                      System.Windows.Forms.Control.WndProc(Message& m)
                      System.Windows.Forms.ScrollableControl.WndProc(Message& m)
                      Telerik.WinControls.RadControl.WndProc(Message& m)
                      System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
                      System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
                      System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
                      System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
                      System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
                      System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
                      System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
                      System.Windows.Forms.Application.Run(Form mainForm)
                      Turien.Schade.PremiumCalculator.LookupTableManager.Program.Main()

        RadContextMenu menu = new RadContextMenu();
        public RadForm1()
        {
            InitializeComponent();
            RadDateTimePicker aDateTimePicker = new RadDateTimePicker();
            RadMenuItem theMenuItem = new RadMenuItem();
            theMenuItem.MinSize = new Size(200, 30);
            RadHostItem theHostItem = new RadHostItem(aDateTimePicker);
            theMenuItem.Children.Add(theHostItem); 
            menu.Items.Add(theMenuItem);
            this.radVirtualGrid1.RowCount = 50;
            this.radVirtualGrid1.ColumnCount = 5;
            this.radVirtualGrid1.CellValueNeeded+=radVirtualGrid1_CellValueNeeded;

            this.radVirtualGrid1.AllowFiltering = true;
            this.radVirtualGrid1.ContextMenuOpening+=radVirtualGrid1_ContextMenuOpening;
        }

        private void radVirtualGrid1_ContextMenuOpening(object sender, VirtualGridContextMenuOpeningEventArgs e)
        {
            int i;
            string theMenuItemText;

            if (e.RowIndex == -3 && e.ColumnIndex < 1)
            {
                e.ContextMenu = menu.DropDown; 
            }
        }

        private void radVirtualGrid1_CellValueNeeded(object sender, VirtualGridCellValueNeededEventArgs e)
        {
            e.Value = Guid.NewGuid().ToString();
        }