Description of problem:
If you double-click on an existing LVM, anaconda throws an exception
in iw/lvm_dialog_gui.pw:314:

	    pesize = int(self.peCombo.get_active_value())

as it turns out, peCombo was initialized to a gtk.Label in __init__,
and this class doesn't implement a get_active_value() method.  I
suppose that FIXME may have to be fixed :-)

Version-Release number of selected component (if applicable):
anaconda-10.0.2-3 (re0910.0)

How reproducible:
Always

Steps to Reproduce:
1.Start the graphical installer on a box with existing logical volumes
2.Get to disk druid and click on an existing logical volume.

Actual Results:  Exception window pops up.

Expected Results:  It should pop up a window to let me assign mount
points to the logical volumes.