A.   * The following code will create a modal password form at runtime. The TPasswordForm type is a TForm descendent class defined either in the current unit or in a separate unit referenced by the current unit's uses clause.

     with TPasswordForm.Create(Application) do
     begin                               ( i.e TForm1, TPasswordForm etc. }
        ShowModal;                       { Display form as a modal window }
        Free;                            { Free the form when it is closed }
     end;

     * The following are the general steps to add a component to a form at  run-time:

     1. Declare an instance variable of the component type that you wish to create {i.e. TButton }. Note: instance variables are used to point to an actual instance of an object. They are not objects themselves.
     2. Use the component's Create constructor to create an instance of the component and assign the instance to the instance  variable declared in step 1.  All components' Create constructors  take a parameter - the component's owner.  Except in special  circumstances, you should always pass the form as the owner  parameter of the component's Create constructor.
     3. Assign a parent to the component's Parent property (i.e. Form1, Panel1, etc).  The Parent determines where the component will be  displayed, and how the component's Top and Left coordinates are  interpreted. To place a component in a groupbox, set the  component's Parent property to the groupbox.  For a component to be visible, it must have a parent to display itself within.
     4. Set any other properties that are necessary  (i.e. Width, Height).
     5. Finally, make the component appear on the form by setting the  component's Visible property to True.
     6. If you created the component with an owner, you don't need to do anything to free the component - it will be freed when the owner is destroyed.  If you did not give the component an owner when you created it, you are responsible for making sure the component is freed when it is no longer needed.

     The following demonstrates how to add a TButton component to the  current form at run-time:

     var
       TempButton : TButton;  { This is only a pointer to a TButton }
     begin
       TempButton := TButton.Create(Self); { Self refers to the form }
       TempButton.Parent := Self;          { Must assign the Parent }
       TempButton.Caption := 'Run-time';   { Assign properties now }
       TempButton.Visible := True;         { Show to button }
     end;

     Since the button was created with an owner, it will be freed  automatically when its owner, the form, is freed.