title: understanding ScrollBox Range
body: <p>I dont understand how to adjust the range of a scrollbar. Say I have 
  <code>image1 : TImage;</code> inside a <code>TScrollingWinControl</code> component. </p>
  
  <p>Now to start I make the range = to the default size of the componet like so.</p>
  
  <pre><code>  width := Image1.width ;
    height := Image1.Height;
    HorzScrollBar.Range := Image1.Width;  
    VertScrollBar.Range := Image1.Height;
  </code></pre>
  
  <p>Up to here I belive I am good. Everything looks good, No scrolling bars will show up like i want. Now I Make only the image bigger, but component stays same size Like so.</p>
  
  <pre><code> Image1.height := Image1.Height +100;
   Image1.Width  := Image1.Width  +200;
  </code></pre>
  
  <p>Now I can tell my image is bigger and the component is same size but the scroll bars never show. So For them to show i need to set the range, This confuses me as </p>
  
  <ol>
  <li>if the Range of a form's Vertical scroll bar is set to 500, and the Height of the form is 200, the scroll bar's Position can vary from 0 to 300. </li>
  </ol>
  
  <p>So here is where i am confused, do i Take the image1.height - Component height and set that as range?  or is the range the whole Image1.height and the scrollbar does the subtracting?  </p>