Hello Jon Barron,
To be able to set the distance between bars to zero use the ItemWidthPercent property and set it to 100% like this:
this.RadChart1.DefaultView.ChartArea.ItemWidthPercent = 100;
You should also change the LayoutMode property of the AxisX to Auto, Between or Inside according to what you like.
For your second question there is a good help topic here - http://www.telerik.com/help/silverlight/radchart-styling-and-appearance-custom-item-style.html
. There is described exactly how to color the bars in a specific color, depending on their value. You can also check this online example
- it shows how to apply MVVM pattern to achieve this.
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