Unfortunately, setting it during InitializeRow doesn't help because the ToolTipText property needs to be set when a dropdown value in a cell is changed. 

Do you think setting it on cell MouseOver would work?  I can try that and have it detect the first value and set the ToolTipText property according to that.  I will post the results when done.

private void gridStudents_MouseEnterElement(object sender, Infragistics.Win.UIElementEventArgs e)
{
// Generate custom tooltip
if (e.Element.GetAncestor(typeof(CellUIElement)) != null)
{
m_tooltipInfo = new UltraToolTipInfo(((CellUIElement)e.Element.GetAncestor(typeof(CellUIElement))).Cell.ToolTipText, Infragistics.Win.ToolTipImage.None, null, Infragistics.Win.DefaultableBoolean.Default);
ultraToolTipManager1.SetUltraToolTip(gridStudents, m_tooltipInfo);
ultraToolTipManager1.ShowToolTip(gridStudents);
}
}

Hello Sam,

If you want to show only the tooltip that comes from the UltraToolTipManager, what I can suggest you is overriding the TipStyleCell property and setting it to TipStyle.Hide, this can be achieved by adding the following line:

ultraGrid1.DisplayLayout.Override.TipStyleCell = TipStyle.Hide;

Please let me know if you have any questions.

Regards,
Ivan Kitanov

I found that after selecting an option from the dropdown in that cell, only the nice ToolTip displays.

I decided to use AfterCellListCloseUp to catch the first dropdown value in order to set the next cell's ToolTipText property.  This works, but I wanted it to come up sooner and have some styling, so I added a UltraToolTipManager and used the MouseEnterElement to set it to the grid.

This is causing the tooltip to display twice, with both styles.  The standard cell one and then the nicer tooltip manager one.

Hello Sam,

If you want, you could achieve this with the MouseHover or MouseEnterElement events and do exactly as you said about obtaining the cell value and setting the tooltip based on it. Similar and maybe an easier approach would be to use the AfterCellUpdate event of the grid and set the tooltip there. The code for it should be similar to the code inside the InitializeRow event from the sample I sent in my previous post with the only difference being is that an if statement should be used to check if the cell is from the column with the dropdown you would like to base the tooltip on.

The code below demonstrates a simple example of using the AfterCellUpdate event to set a tooltip based on the changed value:

 private void ultraGrid1_AfterCellUpdate(object sender, CellEventArgs e)
        {
            UltraGrid grid = (UltraGrid)sender;

            // Turn off the event to prevent recursion
            grid.EventManager.SetEnabled(GridEventIds.AfterCelldate, false);

            try
            {
                if (e.Cell.Column.Key == "State")
                {
                    // If the State is changed, the city is no longer valid, so clear it out.                     
                    e.Cell.Row.Cells["City"].Value = DBNull.Value;
                    e.Cell.Row.Cells["City"].ToolTipText = "Select a City from " + e.Cell.Text;
                }
      
            }
            finally
            {
                // Re-enabled this event. 
                grid.EventManager.SetEnabled(GridEventIds.AfterCellUpdate, true);
            }
        }

Please let me know if you have any questions.

Regards,
Ivan Kitanov