Q:

An MVVM button event with a list view not getting the selected item

I am trying to get the selectedItem from my list view. I am using MVVM light toolkit and the EventToCommand on a button.
My listView is bound to an ObservableCollection which is correctly binding. Here is the listView xaml:
  <ListView   Name="serverListView"
                    Grid.Row="3"
                    Grid.Column="0"
                    Grid.ColumnSpan="2"
                    ItemsSource="{Binding Servers}"
                    ItemTemplate="{StaticResource ServerList}"
                    SelectionMode="Single"
                    BorderThickness="0"/>

I then have a button which I am using Interaction.Triggers with a mvvm EventToCommand, I am not sure if the selectedItem binding is correct. The event is firing correctly through a Relay Command (mvvm light toolkit) but I am getting null every time.
Here is my button xaml;
<Button x:Name="LoadButton"
                Content="Load Server"
                Grid.Column="0"
                Grid.Row="4"
                Grid.ColumnSpan="2">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Click">
                    <mvvm:EventToCommand  Command="{Binding ButtonClick, Mode=OneWay}"
                                            CommandParameter="{Binding SelectedItem, ElementName=serverListView}"
                                            MustToggleIsEnabledValue="True"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </Button>

Relay Command:
 this.ButtonClick = new RelayCommand<object>(new Action<object>(this.GetClickEvent));

A:

You should as well bind the SelectedItem property of the listview to a property (SelectedServer) of your viewmodel, and change your EventToCommand
CommandParameter="{Binding SelectedItem, ElementName=serverListView}"

to
CommandParameter="{Binding SelectedServer}"

