void dayView_MouseMove(object sender, MouseEventArgs e) { if (dayView.GetAppointmentAt(e.X, e.Y) != null) { Appointment appointment = dayView.GetAppointmentAt(e.X, e.Y); //toolTip.ToolTipTitle = appointment.Title; toolTip.SetToolTip(dayView, appointment.Tag.ToString()); } else { //toolTip.ToolTipTitle = ""; toolTip.SetToolTip(dayView, ""); } }