Gantt over time with summed bar - tableau-api

I'm having trouble creating the following chart in Tableau.
I have data that looks like this:
name date count
a 11/10/2012 2
a 12/10/2012 3
a 13/10/2012 2
b 12/10/2012 6
b 13/10/2012 2
b 14/10/2012 3
c 14/10/2012 2
c 15/10/2012 2
And I want to create a bar chart that has the sum of the count on the y axis and time on the x axis. The width of the bar should be the length of the time, like a Gantt chart. Each name has its own bar. Here is an image that shows what I am after.
The bars should overlap if the times overlap.
I have tried various things in Tableau but haven't really got close.
Is this kind of chart possible in Tableau? If not in 7, will it be in 8? I have heard it makes it possible to create some more complex chart types.
A workbook with data can be found at http://community.tableausoftware.com/servlet/JiveServlet/download/188799-12362/Gantt%20over%20time%20with%20summed%20bar.twbx.zip
Thanks for your help,
Andrew

The trick with Gantt charts in Tableau is to put a calculation on the size shelf that calculates the duration of each bar in units of days. See the example screenshot at Tableau example
You also need a continuous date field on the columns shelf to get a horizontal time axis.
In this example, I also did a few more optional things, such as, turned off aggegation under the analysis menu to get a mark per data row, rather than aggegating them, added a discrete date to the rows shelf to make each bar go on a different line (as long as each bar starts on a different date) and hid the column for that start date.

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Drop the measure in the row shelf.
Then grab the same measure with Control key pressed and drop it again on the row shelf.
You will have two instance of the same measure on the row shelf.
Right Click the second measure on the row shelf and click dual axis.
Right click the axis on the worksheet and Edit axis to your choice.
Let me know if this solved your problem.
EDIT
Create 2 calculated feild:
If [FY] = "FY13"
then [Value]
end
call it- 2013
and
If [FY] = "FY14"
then [Value]
end
call it- 2014
Then just do as i have done in this image.