Sorry for my late answer.
I read various articles that you gave me in the comment.
I find a solution but i don't know if it respect MVVM design pattern.
My solution : I have a static class in where i have a static property where i put a instance of container.
In the ConfigureContainer bootstrapper, I update this property.
I use in my differents viewmodels. About my blendability, in the modelview ctor, i test if i was in indesignmodel or not. And if I not in design a call the container throught my 'infrastructure' property.
What do you find about this approach ?
Thanxs a lot for your help.