private void Form1_Load(object sender, EventArgs e)
{
    fpSpread1.ActiveSheet.SetValue(0, 0, "TestTextTip");
    fpSpread1.TextTipPolicy = FarPoint.Win.Spread.TextTipPolicy.Floating;
    fpSpread1.TextTipFetch += FpSpread1_TextTipFetch;
}

private void FpSpread1_TextTipFetch(object sender, FarPoint.Win.Spread.TextTipFetchEventArgs e)
{
    e.TipWidth = 50;
    e.WrapText = true;
}