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Checking In and Activating a Development
Component 
You check in the activity and activate the development component (DC).
You are working in the Development Configurations perspective.
...
1. In the Open Activities view, select your activity and in the context menu, choose Checkin.
2. Enter a description of your changes if you like and choose OK.
A dialog window Activation appears.
3. To build your DC in the CBS, check your selection and confirm it with Activate.
The source files in your activity are built.
You have checked in and activated the DC.