Brian Long's class & component samples
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Class example:

Cars.Dpr          - project file
CarsFormUnit.*    - form unit and form file
CarsClassUnit.Pas - car class implementation unit

Component examples:

DBMyNavigator.pas - simple helper component
RunButton.Pas     - speedbutton with Command property and OnRun event

These two files need to be installed using Component | Install Component...

RunButtonTestProject.Dpr - simple test project for run button component
RunButtonTestUnit.*      - simple form from run button test project

RunButton2.pas - another implementation of TRunButton, this time with an extra event
                 triggered when the launched command terminates. The wait-for-termination
                 is performed by a thread object. This also implements a property editor 
                 for the Command property and a component editor for the component 
                 (right-click a run button on a form designer to check it out