Hello,
Changing dynamically the columns in the TreeList part of the Gantt chart is possible by using the
widget setOptions() method, which is part of its JavaScript API. Note, that such modification could not be done with server code.
Here you will find a small sample of how to achieve the above in JavaScript.
I hope, that this helps. In case you have any other questions, please do not hesitate to contact us.
Regards,
Veselin Tsvetanov
Progress Telerik