Powerpoint 2010 - hiding data series

Hiya

in PP 2003 you just used to have to click on the series in the spreadsheet you wanted to 'hide' and it would 'grey out' in the sheet but still be visible once you opeed the data sheet so you knew the data was there.
In 2010 it seems you have to actually hide the data as in excel and when you click into the data sheet you at first glance dont realise there is hidden data which can be very dangerous!

is there any way that you can hide a data series without it actually disappearing from site on the spreadsheet?

thanks
jenny