In ArcGIS Web Appbuilder (developer edition) I want to add custom widget for specific task, which will be activated by an Expand widget button.
I see that the Expand button has a limited repertoire of icons from
https://esri.github.io/calcite-web/documentation/icons/
but what is the way (if any) to show a png image that I'll prepare myself (not from the suggested repertoire)?
If there is a way, but what is needed is an icon and not png image, then - How would I prepare that icon?
