Pella Window screen for slime shade window

I need the small part that is in the screen that links to the blinds inside the double pane Pella window that allows me to open and close the blinds without removing the screen. I had to redo the screen and the screws on the current plastic part are too rusted to reuse. There is no part no but it says Pella slim shade on it.

Paul,
Yes, that is exactly the part I am looking for. I will go to site and try and order now that I have the part no. Thanks