getting subject in right bottom of screen

[0318]

Hi al..
I have a object called "Ball". When i press a button, the Ball has to appear in the right bottom of the screen.
Maybe that isnt so difficult, but the screen is resizeble.
Can anyone help me with this? i really dont know how to start.

Below the OnClick of the button:

void __fastcall TForm1::Bal_aanClick(TObject *Sender)
{
bal -> right bottom ( dont know the code )
}

greetz andre