The first column in this sheet contain radio buttons.
After clicking the submit button, the number of the selected row is displayed in the output field.
<tc:sheet value="#{sheetController.solarList}"
var="solarobject" selectable="singleOrNone" rows="2"
state="#{sheetController.sheetState}">
<tc:columnSelector/>
<tc:column label="Name">
<tc:out value="#{solarobject.name}"/>
</tc:column>
...
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