passing Canvas to Sub

If I have cvsA and cvsB as Canvases and wish to pass them in turn to a Sub that draws on each, can I use...

Sub Draw(fred)
Rect1.Initialize(x,y, etc)
fred.DrawRect(Rect1, etc)
...
End Sub

such that fred can be either canvas? Not being the result of an action I cannot distinguish by using sender.

Thank you