Preventing a modal dialog from initializing a response

["John Steenson" <chocoboko gmail com>]

Hi,

I have been learning GTKmm.  I am running Gentoo Linux on AMD64, using their provided GTKmm 2.12.1 package.  

I am using Gtk::Builder to generate a modal dialog from a UI file.  A particular problem I have been having is the dialog sends a response signal on the press of every button in the dialog, not just the ones in the action area.  Is this normal behavior?

Here is a snippet:

glade = Gtk::Builder::create_from_file("ui/bifrost-tileset.ui");
glade->get_widget_derived("tilesetDlg", ptrInstance);
ptrInstance->set_modal(true);
result=ptrInstance->run();

The dialog is created, and is shown.  But the dialog has other buttons besides OK and Cancel.  It has a File Chooser button.  When I click on that File Chooser button, a response signal is emitted (alongside the signal I have connected to it to handle the chosen file) and the control flow of the regular program resumes.  Is this normal behavior?  Is there something I need to do in order stop certain widgets from emitting a response?

Thank you.