OptionalAlignText alignment.
Display label for the column header.
Internal field name used by DHTMLX (e.g. 'text', 'start_date', 'duration').
OptionalTemplateCustom template function for cell rendering. Receives the DHTMLX task object.
OptionalTreeShow as tree column (with expand/collapse). Only one column should be tree.
OptionalWidthColumn width in pixels. Use '*' for flex.
Defines a column in the Gantt grid (left side).