Hi,

The TipStyleCell property is only on the Override and I can't find any property on the Column for this, so it looks like there's no really easy property for this. You should Submit a feature request to Infragistics.

In the mean time, you can do this with a CreationFilter. It would look something like this:

    internal class ToolTipCreationFiter : IUIElementCreationFilter
    {
        #region IUIElementCreationFilter Members

        public void AfterCreateChildElements(UIElement parent)
        {
            CellUIElement cellUIElement = parent as CellUIElement;
            if (cellUIElement != null)
            {
                UltraGridCell cell = cellUIElement.GetContext(typeof(UltraGridCell)) as UltraGridCell;
                if (cell != null)
                {
                    if (cell.Column.Key == "String 2")
                        cellUIElement.ToolTipItem = null;
                }
            }
        }

        public bool BeforeCreateChildElements(UIElement parent)
        {
            return false;
        }

        #endregion
    }

At some point, like perhaps in the Form_Load, you just have to assign an instance of the CreationFilter to the grid:

this.ultraGrid1.CreationFilter = new ToolTipCreationFiter();