You can set the XAxis LayouMode to Between:
radChart.PlotArea.XAxis.LayoutMode = Telerik.Charting.Styles.ChartAxisLayoutMode.Between;
This way your bars will be fully visible. However keep in mind that there will be some empty space at the beginning and at the end of the line.
Regarding your other question, this feature is currently not supported. You can try setting secondary YAxis and define its MinValue, Maxvalue and Step, after setting the AutoScale to False.
line.YAxisType = ChartYAxisType.Secondary;
radChart.PlotArea.YAxis2.AutoScale = false;
radChart.PlotArea.YAxis2.AddRange(0, 150, 25);
you can find more information on how to use Secondary YAxis.
the Telerik team
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