The curtain wall unit frame is represented by the outer edges of the primary grid. Each nested grid has its own frame that is defined separately from the primary grid frame. By default, the frames of nested grids are turned off.
A frame assignment defines the frame definition that is used by each frame edge. You can use one frame assignment to assign the same definition to all four edges of the frame, or you can create multiple frame assignments to assign different definitions to different edges of the frame. Unassigned edges are not displayed.
Do not assign multiple definitions to the frame edge because the last definition assigned to the edge is used.
There is a default frame assignment, and you can select the frame edges it applies to. You can modify the default assignment to use any frame definition, but you cannot delete the default frame assignment.
The layer, color, linetype, and other display properties of the default frame are applied to all frame edges unless you assign materials to the frame definition or you create a custom display component for each definition. You can then control the display of each frame definition independently.