Unfortunately, the chart doesn't support tickmarks out of the box. The workaround is to handle FillSceneGraph event and draw the tickmarks there. Here's a code example how you can do this for the Y axis. You can adapt the same approach for the Y axis.

private void ultraChart1_FillSceneGraph(object sender, FillSceneGraphEventArgs e)
{
    if (e.Grid.Count == 0) return;

    IAdvanceAxis xAxis = (IAdvanceAxis)e.Grid["X"];
    IAdvanceAxis yAxis = (IAdvanceAxis)e.Grid["Y"];
    int min = Convert.ToInt32(xAxis.Minimum);
    int max = Convert.ToInt32(xAxis.Maximum);
    int size = 6;

    for (int i = min; i < max; i++)
    {
        Box mark = new Box(new Rectangle(
            (int)xAxis.Map(i) - size / 2,
            (int)yAxis.MapMinimum - size / 2,
            size,
            size
        ));
        mark.PE.Fill = Color.Red;
        e.SceneGraph.Add(mark);
    }
}