Xpages - SSJS code via custom control property - xpages

Question

Is it possible to define some SSJS via property definition on a custom control?
For example, to test, I have a property definition on a custom control called onClickCode. Within said custom control, I have a radio button, and in the onClick/onChange event I try to write compositeData.onClickCode. This seems to execute when the page loads, rather than on the the onClick event.
Code that passes in property definitions is:
<xc:ccQuestionInterimRadiosYesNo required="true"
dataSource="#{document1}" fieldName="Q1"
helpText="Please select an answer"
placeholder="Enter any further details here..."
questionHeader="primary" questionTextNJD="QuestionTextNJD">
<xc:this.radioOptions><![CDATA[#{javascript:return ['Yes', 'No'];}]]></xc:this.radioOptions>
<xc:this.questionText><![CDATA[${javascript:"Ready for section 2?"}]]></xc:this.questionText>
<xc:this.onClickCode><![CDATA[#{javascript:'print("Hello")'}]]></xc:this.onClickCode>
</xc:ccQuestionInterimRadiosYesNo>
Code on the radio button within said custom control is:
<!-- RADIO BUTTON GROUP -->
<xp:radioGroup
loaded="${!empty compositeData.placeholder}"
value="#{compositeData.dataSource[compositeData.fieldName]}"
required="${compositeData.required}" layout="lineDirection">
<xp:this.validators>
<xp:validateRequired
message="#{javascript:compositeData.helpText}">
</xp:validateRequired>
</xp:this.validators>
<xp:this.id><![CDATA[${javascript:"radioGroup"+compositeData.fieldName}]]></xp:this.id>
<xp:selectItems>
<xp:this.value><![CDATA[#{javascript:compositeData.radioOptions}]]></xp:this.value>
</xp:selectItems>
<xp:eventHandler event="onchange"
submit="true" refreshMode="complete">
<xp:this.action><![CDATA[#{javascript:compositeData.onClickCode}]]></xp:this.action>
</xp:eventHandler></xp:radioGroup>
UPDATE:
Custom control on a page passes:
onClickCode="#{javascript:test1}"
Code on the onChange event of a radio button within the custom control:
if (compositeData.onClickCode) {
compositeData.onClickCode.call();
}
Script containing the code is part of my theme:
<script src="/StdServerScripts.jss" clientSide="false"></script>
Code within said script is:
function test1() {
print("Hello");
}