panes
An XML node set specifying a set of panes to show. This is a system generated value set up when you drag the attachment panel onto the design view. You cannot modify the value of this property.
Default value
document(")/*/lxml:data/lxml:panes[@id='<unique id>'] (this is equivalent to the current pane where the unique id is an automatically generated identifier.)
Valid values
Not Applicable. (This value is system maintained.)