How to get a link to the DataGrid?

Question

WPF

There is a table in the View

<DataGrid x:Name="dataGrid"IsReadOnly="True" AutoGenerateColumns="False" ItemsSource="{Binding Path=Articles, Mode=Default, UpdateSourceTrigger=Default}" CanUserResizeColumns="True"></DataGrid >

And there is a ModelView, But I don't understand how to get a reference to the object to update the table or to close the window through the ModelView?

class WindowViewModel : BindableBase
{
//
}