[R] R-Commander - pie charts menu blinded out

[Agrarimmobilien]

Hello,

I hope somebody can help me. I'm using the R-comander with library(Rmcdr).

Using the menu, I added an new data-matrix . After I wanted to draw a pie 
chart, but the problem is, that the pie chart menu is blinded out.

In the concerning variable column, there are no NA -Value (is.na) .

Anybody has a solution?

thxs
Iksmax