RAD Studio VCL Reference
TWinControl.CreateSubClass Method

Creates a windowed control derived from an existing Windows window class.

procedure CreateSubClass(var Params: TCreateParams; ControlClassName: PChar);
__fastcall CreateSubClass(TCreateParams Params, const char * ControlClassName);

Call CreateSubClass in the CreateParams method of a subclassed control, after calling the inherited CreateParams. Specify the parameter record as the value of the Params parameter. CreateSubClass allows VCL controls to create registered Windows controls. 


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