You can override the task box text using BeforeTaskRender event handler:
The following example will show the task text instead of the percentage:
void DayPilotGantt1_BeforeTaskRender(object sender, BeforeTaskRenderEventArgs e)
{
e.Box.Html = e.Text;
}
See also:
http://doc.daypilot.org/gantt/task-customization/