Every order item carries a design type, chosen on the item selector
(the radio buttons Custom Design, Std Design, Std Size, Editable Std
Product, Std Product). The type is saved with the item and is applied again every time
the item is reopened. It decides which tools the item designer offers; the geometry engine itself
never refuses a change because of it.

What each type allows

Two conditions override the table for every type: an item opened for viewing only leaves just
the Options tool on, and editing a document of type 4 in status 40 turns off Mullion, Shapes,
Sash and Edit Profiles. Service and back-order line items turn every tool off regardless of type.

How the selector assigns the type

• Clicking a design tile sets Custom Design (1). If that design has standard sizes, the
  selector then switches the radio to Std Size (2) on its own, and the size you pick in the
  list at the bottom keeps it there — so Select opens the item as type 2 with the design
  tools off. Once a size is picked, the design tiles ignore single and double clicks: the item is
  fixed to that design and size. A right click on any tile cancels the whole selection
  (design, size and item type, size back to the nominal value) so you start again; changing the
  item type away from Std Size also releases the tiles.
• Double-clicking a tile fires Next before that switch happens, so the item opens as
  type 1 with everything enabled. This is why the same design behaves differently between a
  single click plus a size and a double-click.
• Std Design (5) keeps the size fields on in the selector (you type the size); Std Size,
  Editable Std Product and Std Product take the size from the standard-size list. Choosing any of
  the last three with no design selected falls back to Custom Design.
• The web configurator’s selector sends Custom (1), Std Design (5) when a design is clicked and
  Std Size (2) when a size is picked; its Std Product radios are shown but not wired. The web
  designer does not disable tools by type.

Related behaviour

• Applying a standard size from inside the designer (Std Set) switches the item to
  type 2; changing the overall size switches it back to type 1.
• The price on a standard-size row is displayed in the size lists and edited in the
  predefined-design dialog, but it is not applied to the item: a type 2 item is priced by the
  rules exactly like a custom item. Today the lock is the only thing Std Size adds.
• A standard size flagged std size glass locks the width/height fields on its own, whatever
  the type.