I'm trying to make this versatile Double Hung Window Family for our office and I'm having some trouble. I've created a double hung window and I've also created generic face based model of mullion grilles in an 8-lite and a 12-lite pattern with all instance parameters. I've nested the grilles into the window family thinking I could just constrain the grilles to the edge of the glass opening and they would stretch. No. They keep breaking. I then decided to create a formula for the grille size but that doesn't work either. The problem occurs when I toggle the family type parameter from 12 to 8 or vice versa and also when I change the window size from the 48x92 to the 40x56. Any help would be appreciated.
Thanks!