Strict Type Definition
A strict type definition [STD] is like a type definition with well-defined appearance.
Well-defined appearance means that all instances of STD's share the appearance of that STD, e.g. their properties cannot be changed (except of label, caption and enable-state).
This is handy whenever the size, color etc. needs to be fixed. Think of sophisticated screen designs or stacked STDs. STDs are created by saving as this type of control - similar to 'simple' type definitions.