conditionStyle.xaml

<!-- Example of conditional styling -->
<Label Grid.Row="2" Grid.Column="1" Text="{Binding Material.ITEM_STATE_FORMAT}" HorizontalOptions="Center" Style="{StaticResource detailText}">
    <Label.Triggers>
        <DataTrigger Binding="{Binding Material.State}" TargetType="Label" Value="B">
            <Setter Property="Style" Value="{StaticResource detailText}" />
        </DataTrigger>
        <DataTrigger Binding="{Binding Material.State}" TargetType="Label" Value="N">
            <Setter Property="Style" Value="{StaticResource detailTextError}" />
        </DataTrigger>
    </Label.Triggers>
</Label>