gtk/style.go
func (v *StyleContext) GetStyleProperty(property string) (interface{}, error) {
	cstr := (*C.gchar)(C.CString(property))
	defer C.free(unsafe.Pointer(cstr))

	var gval C.GValue
	C.gtk_style_context_get_style_property(v.native(), cstr, &gval)
	val := glib.ValueFromNative(unsafe.Pointer(&gval))
	return val.GoValue()
}
func (v *StyleContext) GetStyleProperty(property string) (interface{}, error) {
	cstr := (*C.gchar)(C.CString(property))
	defer C.free(unsafe.Pointer(cstr))

	var gval C.GValue
	C.gtk_style_context_get_style_property(v.native(), cstr, &gval)
	val := glib.ValueFromNative(unsafe.Pointer(&gval))
	return val.GoValue()
}
// GetStyleProperty is a wrapper around gtk_style_context_get_style_property().