Hi Joko,
I have tried your code and it worked for me. The button is displayed in the header without error with the following header setting:
header: {
visible: true,
buttons: [“search”],
template: “< button > Add</button >”
}
Please check your version and update if available
Best Regards,
Svetoslav Borislavov
Smart HTMLElements Team
https://www.htmlelements.com/
