Followed your directions...
CTRL-C and CTRL-V worked for me...

"gary7" wrote:

Ctrl-C, Ctrl-X and Ctrl-V do not work in the "Edit Series" dialog box.

In Excel 2007, create a simple chart.
Now go to the "Select Data..." dialog box.
Click on a data series, then click on "Edit".
Press the "tab" key to highlight the "Series X values:" field.
Press Ctril-C to copy the contents of the field.
Press the "tab" key to highlight the "Series Y values:" field
Now press Ctrl-V to paste the previously copied text.

What happened?
That's right... nothing happened.

It's the year 2009, and Microsoft has created a dialog box in which Ctrl-C,
Ctrl-X and Ctrl-V do not work. This is progress?

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