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From what should you descend your component

The easiest way is to decend from an existing component that has most of the characteristics you are looking for. If you have to create a custom component from "scratch" then use one of the classes listed below. TComponent - The base starting point for non-visual components. TWinControl - The base starting point for components that need to have window handles. TGraphicControl - A good starting point for visual components that don't need the overhead of a window handle. This class has a Paint method, that should be overridden, but no canvas. TCustomControl - The most common starting point for visual components. This class has a Window handle, common events and properties, and most importantly a canvas with a Paint() method.