RAD Studio
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Creating Components

A component can be almost any program element that you want to manipulate at design time. Creating a component means deriving a new class from an existing one. You can derive a new component in several ways:

The following table summarizes the different kinds of components and the classes you use as starting points for each.  

Component creation starting points  

To do this 
Start with this type 
Modify an existing component  
Any existing component, such as TButton or TListBox, or an abstract component type, such as TCustomListBox  
Create a windowed control  
TWinControl  
Create a graphic control  
TGraphicControl  
Subclassing a control  
Any Windows control  
Create a nonvisual component  
TComponent  

You can also derive classes that are not components and cannot be manipulated on a form, such as TRegIniFile and TFont.

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