title: How to change slide layout programmatically in PowerPoint?
body: <p>I need to change a slide's layout programmaticaly with C# (Add-In Express 2009 for Office and .NET is used). If the new layout is a predefined one then everything is fine, but not if I need to set a custom layout as a new one (without slide recreating). Unfortunately, I didn't find any information on how to do it, PowerPoint object model reference documentation didn't answer me as well. There is just the ability to create a new slide that uses custom layout.</p>
  
  <p>I've done an experiment and have ensured that the <code>Slide</code> object stayed being the same while I have been changing layout both predefined and custom ones. I don't want to create a new slide when I need just switch the layout.</p>
  
  <p>Is it possible at all? Please help me to find a way of doing it.</p>