Parsing custom-typed properties from Glade file

Hello, everyone.

I created a custom widget that has a Glib::Property of an enum type.
Glib::Property<Type> property_type_;

When I try to load from a glade file, I got this error message:

Gtk-WARNING **: 01:43:34.849: Failed to set property
gtkmm__CustomObject_widget_color_slider.type to 1: Could not parse '1' as a
glibmm__CustomBoxed_N6studio11ColorSlider4TypeE

Here is the xml property line:
            <property name="type">1</property>

How can I properly parse the property tag contents ?

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