RAD Studio VCL Reference
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TCustomForm.ActiveMDIChild Property

Specifies the MDI child that has focus.

Pascal
property ActiveMDIChild: TForm;
C++
__property TForm * ActiveMDIChild;

Use ActiveMDIChild to get the MDI child that has focus. 

If the form is not an MDI parent (that is, if the FormStyle property of the form is not fsMDIForm), ActiveMDIChild returns nil (Delphi) or NULL (C++). 

 

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