Cost of using Reflection by WPF Binding Engine

All of sudden, I got this point remembered. Using the Reflection is having the own cost.

But this Binding Engine depends on that one right?

Is there any specific reason, why WPF sticks with this reflections?

I have heard both the upside and the downside of this one. I have used the reflections in the code but somebody advised me, to do it carefully since it will end up in performance issue.

May I know, the solutions/suggestions/discussions on it.

Thanks in advance.