During development process I have found some misleading information in the API documentation.
On the page https://www.bryntum.com/docs/gantt-for-extjs/#!/api/Gnt.plugin.taskeditor.TaskEditor
-- Current
Config options
advancedFormConfig : Object
Configuration of task form placed at Advanced tab. For possible options take a look at Gnt.widget.TaskForm.
Note: This form may not be created if showAdvancedForm set to false.
-- My recommendations
Where 'look at Gnt.widget.TaskForm.' should be replaced with 'look at Gnt.widget.taskeditor.AdvancedForm'.
Also I can not find any information about 'readOnlyConfig' config option for the Gnt.widget.taskeditor.AdvancedForm.
