Box Bay Windows - Change Component Question

[TCDLLC]

I created a box bay window and know how to adjust a window component - size, frame, sill, etc.

But how do you replace the window type with a window from the library?

 

I have a fixed window component and want to replace it with a manufacturer's window with muntins. 

But when I tab to the window component, I cannot select the option to replace it with an item from the library.

 

Any suggestions? 

[TCDLLC]

I found the parameters I needed and it worked.

Thanks so much!