Bug 201042 [Accessibility]Chart scritp should not add by auto when click the down in keyboard[17]
Description: Chart scritp should not add by auto when click the down in keyboard[0704] Step: 1. New a chart and switch to script view. 2. Let the point on the script function selection. 3. Click the down on keyboard. Actual result: A function will add by auto. Expected result: Customer can not select the function under the second function by keyboard, and it should not be added by auto.
chart/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/LineAttributesComposite.java
this.laCurrent = laCurrent;
		if ( laCurrent == null )
		{
			
			this.laCurrent = AttributeFactory.eINSTANCE.createLineAttributes( );
		}
		this.bEnableStyles = bEnableStyles;
		this.bEnableWidths = bEnableWidths;
		this.bEnableVisibility = bEnableVisibility;
		this.bEnableColor = bEnableColor;
		this.wizardContext = wizardContext;
		init( );
		placeComponents( );
	}
	/**
	 * 
	 */
	private void init( )
	{
		this.setSize( getParent( ).getClientArea( ).width,
				getParent( ).getClientArea( ).height );
		vListeners = new Vector( );
	}
	/**
	 * 
	 */
	private void placeComponents( )
	{
		FillLayout flMain = new FillLayout( );
		flMain.marginHeight = 0;