# Behaviors

> .NET Multi-platform App UI (.NET MAUI) behaviors let you add functionality to user interface controls without having to subclass them. Instead, the functionality is implemented in a behavior class and attached to the control as if it was part of the control itself.

Behaviors in MauiReactor are much less useful than in a classic XAML-MVVM project but sometimes you may need to integrate custom functionalities that are provided as behaviors.

{% hint style="warning" %}
Consider carefully whether or not you really need to use Behaviors in MauiReactor. Historically they were created to handle specific functionalities that MVVM approach would have required otherwise custom code-behind.

Behaviors like EventToCommandBehavior or EmailValidationBehavior are useless in MauiReactor while IconTintColorBehavior provides useful functionalities.

Generally, platform behaviors (<https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/behaviors#platform-behaviors>) provide unique functionalities very welcome even in a MauiReactor project.
{% endhint %}

For example, let's consider the `IconTintColorBehavior` (from MAUI CommunityToolkit): it allows to quickly set/change the color used to render a SVG image.

In MauiReactor, you need to scaffold the behavior and put it inside the `View` you want to attach as shown below:

```csharp
[Scaffold(typeof(CommunityToolkit.Maui.Behaviors.IconTintColorBehavior))]
partial class IconTintColorBehavior { }

class BehaviorTestPageState
{
    public Color Color { get; set; } = Colors.Red;
}

class BehaviorTestPage : Component<BehaviorTestPageState>
{
    public override VisualNode Render()
    {
        return new ContentPage()
        {
            new VStack(spacing: 10)
            {
                new Image("shield.png")
                {
                    new IconTintColorBehavior()
                        .TintColor(State.Color)
                },

                new HStack(spacing: 5)
                {
                    new Button(nameof(Colors.Red), () => SetState(s => s.Color = Colors.Red)),
                    new Button(nameof(Colors.Green), () => SetState(s => s.Color = Colors.Green)),
                    new Button(nameof(Colors.Black), () => SetState(s => s.Color = Colors.Black)),
                }
                .HCenter()
            }
            .Center()
        };
    }
}

```

<figure><img src="https://877538538-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fh1eh1igwiwRzrw2kbxSp%2Fuploads%2FkS5U8VvCLuirI7h5dXKG%2FBehavior.gif?alt=media&#x26;token=1330c5f3-833d-4399-a545-4df5d6379e09" alt=""><figcaption><p>Behaviors in MauiReactor</p></figcaption></figure>