Indeed, you can change the FontSize of the Axes' labels by adding
ctlRadChart.DefaultView.ChartArea.FontSize = 10;
Regarding your question about the SeriesItemLabels, you can change their Style by having:
SeriesItemLabelStyle = Resources[
in your code behind.
and also having your new style in the UserControl resources:
Here you can find more information about this topic:
Unfortunately RadChart doesn't support changing the FontSize of the SeriesItemLabel in runtime at the moment. Please accept our apologies. I have logged this issue in our bug tracking system, so our developers will look into it.
the Telerik team
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