I want to customise a tooltip depending on which rows are selected. The problem is I have to click away from the grid and then move the mouse over the selected rows for the tooltip to display. Any ideas?

private void _toolTip_Popup(object sender, PopupEventArgs e)
{
if (e.AssociatedControl != CurveGrid)
{
e.Cancel = true;
return;
}

var dates = CurveGrid.Selected.Rows.All.Cast<UltraGridRow>()?.Select(r => r.GetCellValue("Date")).OfType<DateTime>().ToList();
if (dates.Any())
{
_toolTip.Popup -=_toolTip_Popup;
_toolTip.SetToolTip(CurveGrid, $"CUSTOM TEXT GOES HERE");
_toolTip.Popup +=_toolTip_Popup;
}
else
{
e.Cancel = true;
}
}