I have tried to follow a few forum posts telling to add this config params:
gantt.config.lightbox.sections = [
{ name: "description", height: 38, map_to: "text", type: "textarea", focus: true },
{ name: "type", type: "typeselect", map_to: "type" },
{ name: "time", height: 72, type: "duration", map_to: "auto" }
];
gantt.config.lightbox.project_sections = [
{ name: "title", height: 20, map_to: "text", type: "textarea", focus: true },
{ name: "type", type: "typeselect", map_to: "type" },
{ name: "details", height: 70, map_to: "details", type: "textarea" },
{ name: "time", height: 72, type: "time", map_to: "auto" }
];
gantt.config.lightbox.milestone_sections = [
{ name: "title", height: 20, map_to: "text", type: "textarea", focus: true },
{ name: "type", type: "typeselect", map_to: "type" },
{ name: "details", height: 70, map_to: "details", type: "textarea" },
{ name: "time", height: 72, type: "time", map_to: "auto" }
];
It seems to work fine here:
https://docs.dhtmlx.com/gantt/snippet/d4f83aa7
but in my component I don't see the type select, no matter what I do.