Setting button's IsEnabled to false does not disable button

I have observed that when setting a button's IsEnabled property to false, the button continues to be enabled.

This button is located at the bottom of the grid. I do not observe this behavior in other views though.

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition Height="auto" />
    </Grid.RowDefinitions>

    <Grid.ColumnDefinitions>
        <ColumnDefinition />
    </Grid.ColumnDefinitions>

    <ListView Grid.Row="0"  ItemsSource="{Binding Services}" SelectedItem="{Binding SelectedService}" HasUnevenRows="true">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <ViewCell.View>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition />
                                <RowDefinition />
                                <RowDefinition />
                                <RowDefinition />
                                <RowDefinition />
                            </Grid.RowDefinitions>

                            <Grid.ColumnDefinitions>
                                <ColumnDefinition/>
                                <ColumnDefinition/>
                            </Grid.ColumnDefinitions>

                            <Label Grid.Row="0" Grid.ColumnSpan="2"  Text="{Binding Name}" />
                            <Label Grid.Row="1" Grid.Column="0" Text="Labor:" />
                            <Label Grid.Row="1" Grid.Column="1" Text="{Binding LaborCost, StringFormat='{}{0:c}'}"  />

                            <Label Grid.Row="2" Grid.Column="0" Text="Materials:" />
                            <Label Grid.Row="2" Grid.Column="1" Text="{Binding Materials, Converter={StaticResource MaterialsToCostConverter}, StringFormat='{}{0:c}'}}" />

                            <Label Grid.Row="3" Grid.ColumnSpan="2" Text="{Binding Description}" />
                        </Grid>
                    </ViewCell.View>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

    <Button Grid.Row="1" Grid.Column="0"  Text="Details" IsEnabled="False"
            Command="{Binding ViewService}"/>

</Grid>