Do not forget that all components in Delphi are the objects. Call Create method to create the component and destruct it by Free method. If the component is a window, set parent window and position. This code showing it:
procedure TForm1.Button1Click(Sender: TObject); var Button: TButton; begin Button:=TButton.Create(Form1); try with Button do begin Parent:=Self; Left:=Random(Form1.ClientWidth-Width); Top:=Random(Form1.ClientHeight-Height); Caption:='Button'; end; except Button.Free; end; end;