Hi Mario,

You can do something like this:

        private void ultraGrid1_BeforeSelectChange(object sender, BeforeSelectChangeEventArgs e)
        {
            foreach (UltraGridRow row in e.NewSelections.Rows)
            {
                if (row.Activation == Activation.Disabled)
                {
                    e.Cancel = true;
                    break;
                }
            }
        }