When using Ext. components from the designer toolbox and you then save your project the definitions of these components are not saved into your project.

We need the same ability with a component that has been saved to the toolbox and then subsequently used in a project.

For example, say you create an Extended date field. You create the extended component and then save it to the toolbox. The component is subsequently used in many different projects and will be exported multiple times.
This is (probably) unnecessary as there will already be a single central definition that does not need updating (as it will not change).

This causes multiple unnecessary updates in the change repository (svn) and (in this case) overwrites code I have added into the 'real' base class that is currently not possible to have in designer.