title: Delphi7, create combobox items
body: <p>I would like to give the user a variety of options using combobox. So there are 2 combobox. The 1st one has about 5 options, the second ones items will be created based on what the user will choose at the 1st combobox. </p>
  
  <p>So far, I have tried this: <code>Combobox2.Items.Strings[1]:='xxxx'</code> which appears me this error:</p>
  
  <pre><code>List out of Bound.
  </code></pre>
  
  <p>What should I do?</p>