Extension Framework of AEM Guides (Get active / selected xml element)

AEM Guide when users select a element in the current open DITA file below a breadcrumb shows the path of the selected element
my question how can i get the xpath of the selected element  or even better how to get the active (selected) element in the tcx.activeEditor.xmlDoc
I need to know which xml element is selected in the editor and bind that to the element in the tcx.activeEditor.xmlDoc

Bo, BJ Dita