Setting pango attributes

[Igor Korot <ikorot01 gmail com>]

 Hi, ALL,.
There is a GtkFontChooserDialog class which enable a user to do a font
selection.

However, this dialog does not allow to select some pango attributes - notably
strikethrough and underline.

Is there a way to have some kind of a GUI controls to select them?
If not - why they are not present in the dialog itself?

Thank you.