Movilizer 2.5 screen used to check / uncheck different values in the same row of a table

CheckAndUncheckElements.mxml

<!--
How to check and uncheck buttons in a row.
Only from Movilizer client 2.4.7
-->
<MovilizerRequest 
	systemId="${#Project#SystemID}" 
	systemPassword="${#Project#Password}" 
	numResponses="0" 
	synchronousResponse="true" 
	useAutoAcknowledge="false" 
	xmlns="http://movilitas.com/movilizer/v14">
    
    <moveletDelete moveletKey="checkedAndUnchecked" ignoreExtensionKey="true" />
    
    <moveletSet>
    	<movelet 
    		moveletKey="checkedAndUnchecked" 
    		initialQuestionKey="q1" 
    		moveletType="MULTI"  
    		icon="1" 
    		visible="true">
    		
    		<question key="q1" type="9" title="Check and uncheck" tableRowDetailsEnabled="true">
    			
    			<answer key="a1" clientKey="ck.a1" nextQuestionKey="END" attributeType="11" dummyAnswer="true" triggerScreenValueChangedEvent="true" colIndex="0">
    				<text>OK</text>
    			</answer>
    			
    			<answer key="a2" clientKey="ck.a1" nextQuestionKey="END" attributeType="11" dummyAnswer="true" triggerScreenValueChangedEvent="true" colIndex="1">
    				<text>NOT OK</text>
    			</answer>
    			
    			<answer key="a3" clientKey="ck.a1" nextQuestionKey="END" attributeType="11" dummyAnswer="true" triggerScreenValueChangedEvent="true" colIndex="2">
    				<text>N/A</text>
    			</answer>
    			
    			<onEnterAssignment>
    				i = 0;
    				while (i ?lt 5)
    				{
    					addAnswer($answer:'a1', i, '');
    					addAnswer($answer:'a2', i, '');
    					addAnswer($answer:'a3', i, '');
    					i = i + 1;
    				}
    			</onEnterAssignment>
    			
    			<onScreenValueChangeEvent>
    				function($ref:answerKey, $ref:clientKey, $ref:value, $ref:data)
    				{
    					if (!isBlank(getAnswerValueByClientKey(answerKey, clientKey)))
    					{
    						setAnswerValueByClientKey($answer:'a1', clientKey, '');
    						setAnswerValueByClientKey($answer:'a2', clientKey, '');
    						setAnswerValueByClientKey($answer:'a3', clientKey, '');
    						setAnswerValueByClientKey(answerKey, clientKey, 'X');
    					}
    				}
    			</onScreenValueChangeEvent>	
    		</question>
    	
    		<name>Check and uncheck</name>
    	</movelet>
    	<participant participantKey="${#DEV#ParticipantId}" name="${#DEV#ParticipantName}" deviceAddress="${#DEV#DevideAddress}" />
    </moveletSet>
</MovilizerRequest>