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/TriggerDataComposite.java
Label lblText = new Label( cmpTooltip, SWT.NONE );
		lblText.setText( Messages.getString( "TriggerDataComposite.Lbl.TooltipText" ) ); 
		if ( bEnableShowTooltipValue )
		{
			GridData lblGd = new GridData( );
			lblGd.horizontalSpan = 3;
			lblText.setLayoutData( lblGd );
			txtTooltipText = new Text( cmpTooltip, SWT.BORDER
					| SWT.MULTI | SWT.V_SCROLL );
			GridData gdTXTTooltipText = new GridData( GridData.FILL_BOTH );
			gdTXTTooltipText.horizontalSpan = 3;
			txtTooltipText.setLayoutData( gdTXTTooltipText );
		}
		else
		{
			txtTooltipText = new Text( cmpTooltip, SWT.BORDER | SWT.SINGLE );
			txtTooltipText.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
			btnTooltipExpBuilder = new Button( cmpTooltip, SWT.PUSH );
			GridData gdBTNBuilder = new GridData( );
			gdBTNBuilder.heightHint = 20;
			gdBTNBuilder.widthHint = 20;