Report with drill-down needs to start display at lowest level

Hi,

I'm not sure if this is in the correct forum but I'm hoping that a moderator will move it to the correct area if there is a better place for this.

I have a report working that shows Master Project information, drills to Projects information and then to Tasks information and this is woking correctly. 

For example:
Master Project A
    Project A1
         Task A1-a
         Task A1-b
         Task A1-c
    Project A2
         Task A2-a
         Task A2-b
Master Project B        and so forth.

This works great; the report opens and shows all the data at the Master Project Level (Master Project A & B), the customer clicks on the Master Project name and the Master Project detail info is hidden and the Projects (A1 & A2) are displayed.  If one of these Project names is clicked, the Project detail info is hidden and the Tasks (A1-a, A1-b & A1-c) are displayed.  Everything is great!

BUT, now the customer wants the display to start with the only the Master Project name and Project name displayed and all the Task information displayed.  Then if they click on the Project name, the Task info is hidden and the Project detail info is displayed.  In other words, the reverse of the normal procedure.

I've attempted changing the hide/show on the groups, rows, anywhere I could think of and I cannot get it to display correctly.  Can anyone come up with a solution?

Thanks in advance,
Tina