How to set WebListBox heading titles

How do I set a default title to WebListBox heading?
Currently, I am writing in the Open event.

ListBox1.Heading(0)="aaa" ListBox1.Heading(1)="bbb" ListBox1.Heading(2)="ccc" . . .

But can’t I set it with the Behavior of ListBox?

On the IDE select the Listbox and click on the “pencil” twice.

Oh! Great, Thank you!