Daniel,
Include the last 2 lines below to fix this issue.
void ganttControl_TemplateApplied(object sender, EventArgs e)
{
// While dragging rows, enable dropping as a child of another row.
this.ganttControl.GanttTable.EnableDropAsChild = true;
this.ganttControl.SyncRowBackgrounds = true;
ganttControl.GanttTable.Columns[2].Header = "Start";
ganttControl.GanttTable.Columns[3].Header = "Finish";
// Let the gantt know about the columns corresponding to start and finish for it to do some additional validations when these change.
ganttControl.GanttTable.StartTimeColumnHeaderText = "Start";
ganttControl.GanttTable.EndTimeColumnHeaderText = "Finish";
}
Thanks
RQ Support