Databound ListView Multi-Select and Filtering
<DataTrigger Value="False">
                <DataTrigger.Binding>
                    <MultiBinding Converter="{StaticResource filterToBoolean}">
                        <Binding Path="Description" />
                        <Binding ElementName="txtFilter" Path="Text" />
                    </MultiBinding>
                </DataTrigger.Binding>
                <Setter Property="Visibility" Value="Collapsed" />
                <Setter Property="Focusable" Value="False" />
            </DataTrigger>