How Can I add multi-line tooltip (Hint) to DATA ENTRY grid headings?

UPDATE

I couldn’t make it work through the grid properties from the interface but here is what I did through code and works fine for me. I’m sharing this in case someone comes across the same need.

public override void Initialize()
{
    Page page = HttpContext.Current?.Handler as PXPage;
    if (page != null)
    {
        page.Load += Page_Load;
    }
}

private void Page_Load(object sender, EventArgs e)
{
    Page page = (Page)sender;

    PX.Web.UI.PXGrid approvalGridWithStyle = (PX.Web.UI.PXGrid)ControlHelper.FindControl("grid", page);
    if (approvalGridWithStyle != null)
    {
        approvalGridWithStyle.RowDataBound += (object grdsender, PXGridRowEventArgs erdb) =>
        {
            PMCostProjectionLine data = erdb.Row.DataItem as PMCostProjectionLine;

            if (data != null)
            {
                // Columns Tooltip
                var newLine = Environment.NewLine;
                erdb.Row.Cells["UsrCFBudgetRevised"].Column.Header.ToolTip = "+ Original Budget" + newLine + "+ Budget Modification and Reclassification" + newLine + "+ Budget Approved Change Orders";
                erdb.Row.Cells["UsrCFBudgetProjected"].Column.Header.ToolTip = "+ Revised Budget" + newLine + "+ Budget Pending Change Orders";
            }
            else
            {
                return;
            }
        };
    }
}