I have a box chart that correctly displays the min/max and quartile values that I have in my data.  There is an additional field in the data that I would like to use to place an symbol somewhere on the boxchart element. 

For example, if the min and max are 1 and 10, and the 1st and 3rd quartiles are 2 and 6, I correctly get a boxchart element with a line going vertically from 1 to 10 and having a box going from 2 to 6.  I have an additional value that goes along with this data (in this case let's say that value is 8) that I would like to mark along this box element.  In other words, I want to place a symbol on the box element vertically at Y-axis value of 8.

Is there a way to accomplish this without creating a composite chart?

I created a composite chart that contains a BoxChart and a Scatter Chart.  The X-axis shows the string values for each boxchart element and the Y-axis shows the numeric values.  I added a ScatterChart Layer that uses a numeric X2-axis that ranges from 0 to Max Number of BoxChart elements, but uses the same Y-Axis.  When I do this my symbol is placed in the correct location along the Y-axis, but it does not line up on top of the boxchart element.  It is always off to the side.  How can I make these line up with each other given the X and X2 axes are different types.