image in a tag isn't used for items in ttk::treeview

Shouldn't the inserted item in the following code have an image ?

"""
package require Tk

image create photo test1 -file test1.gif
ttk::treeview .t
.t tag configure imgtest -image test1
.t insert {} end -text test -tags imgtest
pack .t
"""

The "imgtest" tag should provide the "test1" image to that item, since that item has no image directly associated with it.