GTKD2 GValue Type

[Sergey via Digitalmars-d]

     Hello everyone!

I try to use gtkd + d in production, and of course I started with 
gtk.TreeView and gtk.ListStore objects. But I encounter a problem 
with GValyue type:

GValue[] array_values = 
cast(GValue[])["str1","str2","str3","str4"];
file_1.d(92): Error: e2ir: cannot cast "str1" of type string to 
type GValue
...

ListStore1.setValuesv(itr, [0,1,2,3], 
"str1","str2","str3","str4");
file_1.d(98): Error: function gtk.ListStore.ListStore.setValuesv 
(TreeIter iter, int[] columns, GValue[] values) is not callable 
using argument types (TreeIter, int[], string, string, string, 
string)

GValue ggg = cast(GValue)"123";
file_1.d(78): Error: cannot cast from string to GValue

GValue ggg = "123";
file_1.d(79): Error: cannot implicitly convert expression ("123") 
of type string to GValue

How to deal with this type?

thanks in advance.