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uses 
  ...,ImageClass_u;

type
  TForm1=class(TForm)
    ...
    SelImage:TSelImage;
  private
    ...
  end;

implementation

procedure TForm1.create(sender:TObject);
begin
  selImage:=TSelImage.Create(self);
  selImage.Parent:=Scrollbox1;
  selImage.OnSelectionChange:=SelImageSelChange;
end;

procedure TForm1.Destroy(sender:TObject);
begin
  selImage.free;
end;