Make ViewModelViewHost work in design mode

[haacked]

We need to add:

if (DesignerProperties.GetIsInDesignMode(this)) return;

To the class so it doesn't override Content set up in XAML in design mode.

[anaisbetts]

Whatchu gonna do submit this as an issue and no PR??

[anaisbetts]

Imma get credit for this one

[anaisbetts]

Fixed in fc1cf34

[haacked]

Whatchu gonna do submit this as an issue and no PR??

You didn't give me a chance! I submitted it after a long day and I crashed right after. Took the last reserves of my energy to lift my finger and drop it on the Enter key. 😛

[haacked]

So when's this going to show up on NuGet? 😄