hello, I tried to follow the embedded chart sample code at - https://bryntum.com/products/schedulerpro/examples/embedded-chart/
May I know how the ButtonColumn widget column changes the icon from "b-fa-chevron-down" to "b-fa-chevron-up"? I can see when the down icon is clicked, it calls
record.toggleExpanded()
.
but I don't get how the icon updates. Please clarify, thank y