Hi Heiko,

The described behavior is caused by the fact that the [rowClass] input is a functionality of the TreeList component used in the Gantt left-hand side "treelist" pane. The right-hand side "timeline" pane consists of several separate tables, and this is why the class(es) returned by the rowClass callback are currently not applied to its rows.

As providing the opportunity to apply the same (or different) class(es) to the rows in both the treelist and timeline panes of the Gantt based on some custom logic and the specific task, related to the given row, will be indeed a nice enhancement, we will convert this thread to a feature request, and will track the customer demand for it. We will consider adding this functionality to our future plans based on the interest and perceived business value.

I also updated your Telerik points as a small token of gratitude for the nice suggestion.

Regards,
Dimiter Topalov
Progress Telerik