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/HeadStyleChooserComposite.java
{
	private static final Integer[] iLineDecorators = new Integer[]{
			new Integer( LineDecorator.ARROW ),
			new Integer( LineDecorator.NONE ),
			new Integer( LineDecorator.CIRCLE )
	};
	static class HeaderStyleChoice extends HeadStyleCanvas
			implements
				ICustomChoice
	{
		HeaderStyleChoice( Composite parent, int iStyle, int iLineDecorator )
		{
			super( parent, iStyle, iLineDecorator );
		}
		public Object getValue( )
		{
			return new Integer( getHeadStyle( ) );
		}
		public void setValue( Object value )
		{
			setHeadStyle( ( (Integer) value ).intValue( ) );
		}
	}