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
gdLBLTriggerEvent.horizontalIndent = 4;
		lblTriggerEvent.setLayoutData( gdLBLTriggerEvent );
		lblTriggerEvent.setText( Messages.getString( "TriggerDataComposite.Lbl.Event" ) ); 
		cmbTriggerType = new CTextCombo( this, SWT.NONE );
		GridData gdCMBTriggerType = new GridData( GridData.FILL_HORIZONTAL );
		cmbTriggerType.setLayoutData( gdCMBTriggerType );
		cmbTriggerType.addListener( new Listener( ) {
			public void handleEvent( Event event )
			{
				updateTrigger( lastTriggerType );
				updateActionTypeItems( );
				Trigger trigger = (Trigger) triggersMap.get( cmbTriggerType.getText( ) );
				
				if ( trigger != null && triggerMatrix.check( trigger ) )
				{
					cmbActionType.setText( getActionText( trigger ) );
				}
				else
				{
					cmbActionType.select( 0 );
				}
				updateUI( trigger );
				switchUI( );
				lastTriggerType = cmbTriggerType.getText( );
			}
		} );
		Label lblActionType = new Label( this, SWT.NONE );
		GridData gdLBLActionType = new GridData( );
		gdLBLActionType.horizontalIndent = 4;
		lblActionType.setLayoutData( gdLBLActionType );