title: How can I do This effect?
body: <p>I'm Trying to do, in delphi, that when you press a button, I display a drop-down panel with options like this:</p>
  
  <p><img src="https://i.stack.imgur.com/QVQxf.gif" alt="Panel Desplegable"></p>
  
  <p>Does anyone know how to make this effect with VCL?
  Now I have a form with 2 panels, the main is always showing and has a side button, and when I press the button the side panel is shown, but I would like to make the effect.
  Thank you</p>