ModifyHabitPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="beadando.ModifyHabitPage"
             x:Name="modifyHabitPage">

    <Shell.BackButtonBehavior>
        <BackButtonBehavior IsEnabled="False" />
    </Shell.BackButtonBehavior>

    <VerticalStackLayout>

        <StackLayout Padding="20">
            <Label Text="Text" FontSize="20" />
            <Entry Text="{Binding Text}" Placeholder="Habit text" />

            <Label Text="Color" FontSize="20" />
            <StackLayout Padding="20">

                <Label Text="Red" />
                <Slider Minimum="0" Maximum="255" Value="{Binding Red, Mode=TwoWay}" />

                <Label Text="Green" />
                <Slider Minimum="0" Maximum="255" Value="{Binding Green, Mode=TwoWay}" />

                <Label Text="Blue" />
                <Slider Minimum="0" Maximum="255" Value="{Binding Blue, Mode=TwoWay}" />

                <BoxView HeightRequest="100" WidthRequest="100" Color="{Binding SelectedColor}" />

            </StackLayout>

            <Button Text="Save modifications"
                    Command="{Binding Path=ModifyHabit, Source={x:Reference modifyHabitPage}}" />
                    

        </StackLayout>
    </VerticalStackLayout>
</ContentPage>