Hello Daniela,
Onto your questions:
To be able to have the grid appear on top, you should set its ZIndex to 102 or higher value. Here's why - the RadarSeries ZIndex is calculated by accumulating the default ZIndex of the ChartElementPresenter which is -1 to the default series ZIndex which is 100.
Having the center of the gradient to appear in the center of mass of the Series is absolutely normal and expected since you set the GradientBrush as Fill to the Series. Could you please send us a sample image demonstrating how do you want your PolarChart to look like and we'll do our best to help you achieve it?
As for the labels - currently LabelFitMode property works with CartesianChart series only. What I can suggest to make your labels readable is that you wrap their text with the following style:
The style can be applied like this:
Regards,
Evgenia
the Telerik team
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