Python Borderless ttk.Treeview

Question

I have a treeview that I don't want to have borders, I managed to do it with borderwidth=0, however when selecting an element the border reappears, I tried to put borderwidth=0 when selecting or focusing the object but it didn't work instead it continued to show a border, I attached images and the code.

tree = ttk.Treeview(
 scrollable_frame,
 show="tree",
)
tree.pack(fill="both", expand=True, padx=0, pady=0)
style = ttk.Style()
style.theme_use("default")
style.configure(
 "Treeview",
 background="#264CBF",
 fieldbackground="#264CBF",
 foreground="white",
 rowheight=25,
 bordercolor="#264CBF",
 highlightthickness=0, 
 relief="flat", 
 borderwidth=0,
)
style.map(
 "Treeview", 
 background=[("focus", "#213B90")], 
 foreground=[("focus", "white")], 
 highlightcolor=[("focus", "#264CBF")], 
 bordercolor=[("focus","#264CBF")],
 relief=[("focus","flat")],
 highlightthickness=[("focus",0)],
 borderwidth=[("focus",0)]
)

Selected object Unselected object

• user4136999: style.layout("Treeview", [('Treeview.treearea', {'sticky': 'nswe'})]) # Remove the borders