gtkmm: Dialogs

# Dialogs

## Classes
class | Gtk::AboutDialog
| The AboutDialog offers a simple way to display information about a program like its logo, name, copyright, website and license. More...
class | Gtk::Assistant
| A widget used to guide users through multi-step operations. More...
class | Gtk::ColorSelectionDialog
| This dialog allows the user to select a color. More...
class | Gtk::Dialog
| Create popup windows. More...
class | Gtk::FileChooserDialog
| Convenient file chooser window. More...
class | Gtk::FontSelectionDialog
| A dialog box for selecting fonts. More...
class | Gtk::MessageDialog
| Convenient message window. More...