Chart with duration datas in Numbers '09
here's my problem (and sorry for the bad english).
I created a Table and filled with data. In the first column i entered DVD movie's titles and in the second column the duration of those movies. I formatted the cells correctly with the "duration" option so that they show "1h 12m" for example. Now i want to create a Chart with the duration in the Y axis and the movies on the X axis but I'm unable to do so because when I try to select "duration" in the format cell of "Value of X Axis" of the chart options it's greyed out. How can i do? (I can successfully create Charts from numeric values but not from "duration" values.
I'll appreaciate any answer thank you again.
MacBook, Mac OS X (10.6.2), iWorks 09