So working on implementing my mockup sent to the mailing list concerning more advanced metadata editing into Inkscape now. Though I've hit an error I can't understand, any help is appreciated.

### My problem

The problem I have is that I can add new VBox and ScrolledWindow without problem to document-properties.cpp|h and compile it. When I try to add Gtk::Paned or Gtk::HPaned I get the following errors.

error: ‘Paned’ in namespace ‘Gtk’ does not name a type
error: ‘HPaned’ in namespace ‘Gtk’ does not name a type

I've tried to add it in a mockup outside of Inkscape and it works. Any ideas what this could be caused by?

### Another question

As a side note I'm trying to add a paned window to the document properties notebook which has each page built up by tables/grids. Is it wise to add a Paned window to the this notebook and moving away from the common practices of using the table/grid layout?