Hello Klaus,

It is impossible to create an instance of the ViewModelBase only via XAML, because based on MVVM (Model-View-ViewModel) pattern definition, we have to separate Model, View, and ViewModel.

The View responsible to displaying and collecting data form end users. It is not responsible for retreiving data and business rules(validating data).
The ViewModel responsible to aggregating and storing data which will be bound to a View.
In brief, on MVVM pattern, the View doesn't have to worry about retreiving data and know where data comes from.

Hope this helps.
Riendy

Regards,
Riendy

Hello Klaus,

I'm apologize if my post did not answer your question.

Let me clarify my answer, to create an instance of the ViewModel, we have to input user interaction logic using ViewModel layer (i.e. CustomersViewModel.cs) and then we instantiate the ViewModel in the XAML, not in code behind.

i.e.

<Intersoft:UXPage.Resources>
    <ViewModels:CustomersViewModel x:Key="CustomersViewModel"/>
    ...
</Intersoft:UXPage.Resources>
<Grid x:Name="LayoutRoot" DataContext="{StaticResource CustomersViewModel}">
</Grid>

Could you please let me know which particular code of MVVM sample(to create an instance of the ViewModelBase) that you found in code behind?

Hope this helps.
Riendy