How can I binding canvas to an observablecollection WPF

Question

I created a Scroll bar at the bottom of the window,

to scroll a simple text written manually, it works well

But I want to scroll a list of items from my database, I do the binding to an ObservableCollection.. but I don't have the return of my ItemSource... I have the return :

(Collection)

in the Scroll bar !

the result: