add error bar to the mean of Scatter Dot Plot

I play around the Scatter Dot Plot panel, it works great. However, when I try to add error bars to the means, there is a problem. It looks like that the mean is drawn as a line between two points of a wave, which make the look of the error bars weird. Can you change the way the mean is drawn to something like a line marker? And can you also add the error bar function to the Scatter Dot Plot panel?