Remove Radial background and remove border padding in charts - lightningchart

From version 4 there seems to be some error when Themes.dark is used
Uncaught TypeError: Cannot read properties of undefined (reading 'isDark')
Also not able to remove radial background in charts
chartXY.setBackgroundFillStyle(new SolidFill({color:ColorRGBA(...)}))
Also padding , margins are there around charts.
How do I make the background pure black , remove padding , margin around dashboard charts(multiple charts in single chart)
Thanks.

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alt text http://img815.imageshack.us/img815/9030/homex.png
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