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.
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/internal/ui/editors/script/JSEditor.java
*/
	protected void hideValidateButtonIcon( )
	{
		hideControl( butValidate );
		hideControl( validateIcon );
	}
	/**
	 * Hides a control from its parent composite.
	 * 
	 * @param control
	 *            the control to hide
	 */
	private void hideControl( Control control )
	{
		Object layoutData = control.getLayoutData( );
		if ( layoutData == null )
		{
			layoutData = new GridData( );
			control.setLayoutData( layoutData );
		}
		if ( layoutData instanceof GridData )
		{
			GridData gridData = (GridData) layoutData;
			gridData.exclude = true;
			control.setLayoutData( gridData );
			control.setVisible( false );
		}
	}
	private void initScriptLabel( Composite parent )
	{