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/GanttLineAttributesComposite.java
* @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent)
	 */
	public void widgetSelected( SelectionEvent e )
	{
		Object oSource = e.getSource( );
		if ( oSource.equals( cbVisible ) )
		{
			
			fireValueChangedEvent( GanttLineAttributesComposite.VISIBILITY_CHANGED_EVENT,
					new Boolean( cbVisible.getSelection( ) ) );
			
			if ( isDisposed( ) )
			{
				return;
			}
			
			boolean bEnableUI = cbVisible.getSelection( );
			if ( bEnableStyles )
			{
				lblStyle.setEnabled( bEnableUI );
				cmbStyle.setEnabled( bEnableUI );
			}
			if ( bEnableWidths )
			{
				lblWidth.setEnabled( bEnableUI );
				iscWidth.setEnabled( bEnableUI );
			}
			if ( bEnableColor )
			{
				lblColor.setEnabled( bEnableUI );