Bug 312761 It makes no difference changing the series labels position in Radar chart.[13]
chart/org.eclipse.birt.chart.ui/src/org/eclipse/birt/chart/ui/util/ChartUIUtil.java
public static final int BUTTON_HEIGHT = 20;
	
	public static final int BUTTON_WIDTH = 20;
	/**
	 * @param gridData
	 * 
	 * @since 2.3
	 */
	public static void setChartImageButtonSizeByPlatform( GridData gridData )
	{
		if ( isWindows( ) )
		{
			gridData.heightHint = BUTTON_HEIGHT;
			gridData.widthHint = BUTTON_WIDTH;
		}
	}
	/**
	 * @param gridData
	 * 
	 * @since 2.3
	 */
	public static void setChartImageButtonHeightByPlatform( GridData gridData )
	{
		if ( isWindows( ) )
		{
			gridData.heightHint = BUTTON_HEIGHT;
		}
	}
	/**