Bug 312761 It makes no difference changing the series labels position in Radar chart.[13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/type/impl/PieSeriesImpl.java
public void unsetLeaderLineStyle( )
	{
		LeaderLineStyle oldLeaderLineStyle = leaderLineStyle;
		boolean oldLeaderLineStyleESet = leaderLineStyleESet;
		leaderLineStyle = LEADER_LINE_STYLE_EDEFAULT;
		leaderLineStyleESet = false;
		if ( eNotificationRequired( ) )
			eNotify( new ENotificationImpl( this,
					Notification.UNSET,
					TypePackage.PIE_SERIES__LEADER_LINE_STYLE,
					oldLeaderLineStyle,
					LEADER_LINE_STYLE_EDEFAULT,
					oldLeaderLineStyleESet ) );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public boolean isSetLeaderLineStyle( )
	{
		return leaderLineStyleESet;
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public double getLeaderLineLength( )
	{
		return leaderLineLength;
	}