I'm building an application with WPF in MVVM style. I'm trying to make filter on my `DataGrid` when I check or uncheck several CheckBoxes for filtering.

I've found solution with `Interaction.Triggers`, but it's not working for me in this case.

Here is my code:

```
<ListBox 
            ItemsSource="{Binding PortsFilterSource}"
            Background="LightGray"
            BorderThickness="0"
            Grid.Column="1">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <CheckBox 
                        Content="{Binding Name}"
                        IsChecked="{Binding IsChecked}">

                        <i:Interaction.Triggers>
                            <i:EventTrigger EventName="Unchecked">
                                <i:InvokeCommandAction Command="{Binding FilterCommand}"/>
                            </i:EventTrigger>
                            <i:EventTrigger EventName="Checked">
                                <i:InvokeCommandAction Command="{Binding FilterCommand}"/>
                            </i:EventTrigger>
                        </i:Interaction.Triggers>
                    </CheckBox>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

```

Everything is working great except `FilterCommand`. I have this in my C# code:

```
public DelegateCommand<object> FilterCommand { get; set; }
...
FilterCommand = new DelegateCommand<object>(Filter);

```

`Filter(object obj)` is a function, but it is not entered when I check or uncheck any of my CheckBoxes.

Any help would be very appreciated.