I just want to note that I'm evaluating the Free Trial chart to do this.  If what I have in the picture above is doable, my team will buy 4 developer licences for it next week.  Any additional support you can offer would be great.  Thanks!

I have gotten around the above problem by creating a custom mapping of the coordinates based on their index, and providing a custom function to resolve the datapoints based on their property values that match the current labels.

I'd still like to know if there is a better way to do this.  How do the bar charts do it?

Also, how can I center my labels like in the bar chart, and not have them appear at the tick marks?  

Here is a picture of what I'm trying to do:

I have data points:

[A, 1]
[B, 2]
[B, 3]
[C, 4] 

Items source is set to my collection of datapoints, and I'd like the chart to show the following:

Hi Stefan,

The arguments of those functions take a double.  This is precisely my problem.  Since my data is label based, I don't have a double value.  When I set the CategoryXAxis.ItemsSource, the collection contains only string values, and I need to match those string values to my data.

For example:

My chart consists of the following axis:

XAxis : red, yellow, green
YAxis : orange, pear, apple 

apple   |
pear    |
orange |_______________________ 

               red   yellow    green

My datapoints are:

{ red, apple }
{ yellow, pear }
{ green, orange }

The resulting plot should be:

apple   |   X
pear    |              X
orange |_________________X_____ 

               red   yellow    green

Now to plot { red, apple }, I somehow need to resolve red to a coordinate of the grid.  When I initially passed in my values to the CategoryXAxis [red, yellow, green], somehow they got plotted on coordinates 0, 1, and 2.

So how do I get the coordinate of where { red, apple } goes?  I can't pass in XAxis.GetScaledValue(red, params), as it is not a double.

How did the CategoryXAxis figure out where red should be in the first place?  Shouldn't I have some value mapping function that will match my data type to where it belongs?  Clearly the other grids can somehow do this.