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
this.slValues.topControl = cmpScript;
				ScriptValue scriptValue = (ScriptValue) trigger.getAction( )
						.getValue( );
				txtScript.setText( ( scriptValue.getScript( ).length( ) > 0 )
						? scriptValue.getScript( ) : "" ); 
				break;
			case INDEX_5_HIGHLIGHT :
				this.slValues.topControl = cmpHighlight;
				
				
				
				
				
				
				
				break;
			case INDEX_6_CALLBACK :
				this.slValues.topControl = cmpCallback;
				break;
			case INDEX_7_TOOGLE_DATAPOINT :
				this.slValues.topControl = cmpDPVisibility;
				break;
			default :
				this.slValues.topControl = cmpDefault;
				break;
		}
		grpValue.layout( );
	}
	public Trigger getTrigger( )
	{