[gtkmm] adding a widget to a fileselection dialog.



hello;
I have a fileselection dialog (Selection)
and I'm trying to attach another VBox at the end or possibly an Image widget if is possible to do so without necessarily attaching a extra VBox first. I'm not sure if this is correct because even though is not crashing, it's not displaying the image:

Gtk::VBox *vbox, vbox2;
Gtk::Image image;
image.clear();

vbox = Selection->get_main_vbox();
vbox->add(vbox2);
vbox2.show();
vbox2.add(image);
image.set(Selection->get_filename().c_str());
image.show();

what I'm trying to do is, since the fileselection displays the file path of some picture files, I need an extra widget to display a preview when a a given picture is selected.

Any help/ suggestion is appreciated
Thanks in advance
David






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