Hi Marcos,

The StatusBarTemplate is refreshed each time a selection is made. The Change event, however, fires before the re-rendering of the StatusBarTemplate has completed, thus the component in the template is not yet initialized. I can suggest the following update in the Change event logic, so the handler logic is executed after the rendering has completed:

<script>
    function onTest(e) {
        queueMicrotask(() => {
            let testButton = $("#TestButton").data("kendoButton");
                testButton.enable(true);
            });
        }
</script>

Regards,
Aleksandar
Progress Telerik