Gantt APITemplatesgrid_fileOn this pagegrid_file Description Specifies the icon of child items in the tree column grid_file: (task: Task) => string;Parameters task - (required) Task - the task object Returns text - (string) - html text which will be rendered in the gantt Examplegantt.templates.grid_file = function(item) { return "<div className='gantt_tree_icon gantt_file'></div>";};Related Guides Templates of the Grid Configuring the Tree Column