Hi Gary Blakely,
The best approach to populate the RadChart control is using the ItemsSource property together with series mappings. This approach enables using of zooming and scrolling, sorting, filtering, grouping and aggregation. As you can see from most of our examples we try to use that approach.
About the Axis - usually you would want to leave the default setting AutoRange=true and the axis will configure itself according to the data series you have. It will find the min and max values across all series, and choose a reasonable step. In certain cases you can turn this automatic logic off and manually set the axis min, max and step.
We understand that some of these concepts are not ideally explained for customers who are new to charts and we take your feedback seriously. We will do our best to improve our help not only with "hows" but with explanations of "why" a certain setting is more appropriate etc. etc.
the Telerik team
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