The Gantt view seems to scroll horizontally in a very strange way. It doesn't allow you to scroll the entire width of the project and stops at either margin and then you need to grab the scroll bar again and go more. Is there anyway to have it scroll as I think most people would expect it to scroll which is across the entire project timeline width without having to do it in "chunks"?
I didn't think the original question quite got answered, i.e. that the gantt "doesn't allow you to scroll the entire width of the project and stops at either margin and then you need to grab the scroll bar again and go more",
So I asked the question again here: http://es.infragistics.com/community/forums/t/89137.aspx and on that thread Michael clearly states that "Dragging the horizontal scrollbar left or right will not bring you to the beginning or end of a particular task because isn't a correlation between the scrollbar and the tasks displayed by the control". I'm assuming that also means it doesn't correlate to a particular time range, which I think is the answer to your original question?
I think that's not the behaviour most users would expect (or certainly those coming from MS Project or Suretrack/P1 etc), so I've added a feature request here: http://ideas.infragistics.com/forums/192359-windows-forms/suggestions/5818498-add-a-scroll-mode-to-the-winganttview. Give it a vote if this is what you are looking for too?
Cheers, Tom