Designers are visual design time editors for creating and manipulating components and properties.
The following designers are currently available: The Frame Designer is a GUI building view on wxFrame type modules that cooperates closely with the Inspector.
When a designer is opened a transaction is started. When you end the transaction either by posting or cancelling all your changes will be applied to the source.
While the designer is open for a module, the source code will be read-only.

A DataView will also be opened with the Designer and closed on posting / cancelling, this will usually be the last view of the module in the Editor..

Collection Editors maintain list like properties.