c# WPF AlternateContent doesn't exist in the Namespace […]

Question

I am facing the need to have XAML Code only in design-time. I have found a nice Solution to this, which can be found here. It seems like there are a few guys having a Proble

Answer 1

It seems like this is a common VS problem which can be solved by this code

mc:Ignorable="d mc"

This must be added to the root element of the view.
Note: that you already should have mc:Ignorable="d" in your root element, so you have to just add the mc to it.