protected void btnAddContextMenuItem_Click(object sender, EventArgs e)
{
// ExStart:AddContextMenuItem
// Init context menu item command button
CustomCommandButton cmd = new CustomCommandButton();
cmd.CommandType = CustomCommandButtonType.ContextMenuItem;
cmd.Text = "MyNewContextMenuItem";
cmd.Command = "MyNewContextMenuItemCommand";
// Add context menu item command button to GridWeb
GridWeb1.CustomCommandButtons.Add(cmd);
// ExEnd:AddContextMenuItem
}