title: TScrollBar doesn't scroll to the end of panel
body: <p>I work with Borland C++ to develop my application.
  I have a panel in which i will put dynamically items (labels for example).
  In this panel, I add scrollBar.
  My question is how to calculate PageSize (or other parameter) to let all item visible when scrolling ?</p>
  
  <p>Thank you!</p>