title: Delphi 6 TListBox OnMeasureItem() and OnDrawItem() never called for lbOwnerDrawVariable() list box
body: <p>I have a Delphi 6 app with a TListBox control set to lbOwnerDrawVariable.  At run-time I add a single string to the list box.  I have event handlers for OnMeasureItem() and OnDrawItem() and I set breakpoints on the very first line of code in each event handler.  However neither of them are ever called.  Not once.  Not even if I make an Explicit <strong>Refresh</strong> or <strong>Repaint</strong> call on the list box.</p>
  
  <p>This is really basic stuff so what is it that I am doing wrong that could inhibit the calling of those event handlers and subsequently disrupting my owner draw code?  The single string does show in the list box properly.  I threw in an OnClick() event handler just to see if it worked and did.</p>