What is the Subclassing ? Explain custmized control development ?
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Usually when we are placing controls on any dialogbox or window (frame) we are handling its messages in controls parent class, i.e. the window or diaglog which is holding the controls.

In such cases we are restricted to certain functionality only. We can not ad extra functionality in this way.

Subclassing allows to customize the controls as per user convenience.

Subclassing is a way to handle the controls messages in control itsself instead of handling in parent window.