This sample is to display the vertical and horizontal lines in the background of the chart.

<backgroundElements>
	<GridLines direction="both" verticalChangeCount="1" horizontalChangeCount="1">
		<horizontalStroke>
			<Stroke color="0x999999" alpha="0.5" weight="1"/>
			color:sets color, alpha: sets transparency, weight: sets thickness
		</horizontalStroke> 
		<horizontalFill>
			<SolidColor color="0xEEEEEE" alpha="0.5"/>
			color:sets color, alpha: sets transparency
		</horizontalFill>
		<horizontalAlternateFill>
			<SolidColor color="0xFFFFFF" alpha="0.5"/>
			color:sets color, alpha: sets transparency
		</horizontalAlternateFill>
		<verticalStroke>
			<Stroke color="0x999999" alpha="0.5" weight="1"/>
		</verticalStroke>
		<verticalFill>
			<SolidColor color="0xFFFFFF" alpha="0.5"/>
		</verticalFill>
		<verticalAlternateFill>
			<SolidColor color="0xEEEEEE" alpha="0.5"/>
		</verticalAlternateFill>
		<horizontalOriginStroke>
			<Stroke color="0x999999" alpha="0" weight="1"/>
		</horizontalOriginStroke>
	</GridLines>
</backgroundElements>