Hi,

Although I do not see any events specific to this operation, what if you tried the following code to identify when the columns are shown / hidden:

        private void ultraGrid1_AfterColPosChanged(object sender, Infragistics.Win.UltraWinGrid.AfterColPosChangedEventArgs e)
        {
            for (int i = 0; i < this.ultraGrid1.DisplayLayout.Bands[0].Columns.Count; i++)
            {
                System.Diagnostics.Debug.WriteLine(this.ultraGrid1.DisplayLayout.Bands[0].Columns[i].Header.Caption + ":"+ this.ultraGrid1.DisplayLayout.Bands[0].Columns[i].Hidden);
            }
        }

See if this can help you to accomplish your programming goal. It seems to work for me in regards to informing me whenever columns are shown / hidden. You can iterate through the columns in this event and determine which columns are visible or hidden.