WPF and XAML for me is broken. Too many dynamic elements, which are checkable during runtime -- that's very bad. So use XAML all UI I know during design stage -- if the text is bold or not, wiring data, setting converters, validators, and so on.
I don't know what exactly you mean by clean code. If it is clean, I use clean code, if not -- I don't, and I don't care anyway, it seems more logical for me.
