Infopath Conditonal Format Expressions

Question

Using conditional formatting I'm trying to hide/show a control based on the number of items selected in a multi select listbox.

I'm having trouble finding the correct expression that will give me the count of selected items out of the multi select listbox.

Here's what I've got right now, just trying to figure out what the correct XPATH is to get to the list boxes items.

count(../my:secRestatement/my:secGeography/my:secWriteGeo/my:lbWriteGeo) > 0

lbWriteGeo is the multi select listbox.

Thanks.