Sample Xaml Binding

Login.Xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="CustomerApp.Views.Login"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"    
    xmlns:behaviors="clr-namespace:CustomerApp.Infrastructure.Behaviors;assembly=CustomerApp"
    xmlns:c="clr-namespace:CustomerApp.Infrastructure.Converters;assembly=CustomerApp"
    Style="{StaticResource SignUpScreen}">
    <ContentPage.Resources>
        <ResourceDictionary>
            <c:DictionaryItemConverter x:Key="DictBool" />
        </ResourceDictionary>
    </ContentPage.Resources>
    <StackLayout
        Margin="10,0,10,0"
        HorizontalOptions="FillAndExpand"
        VerticalOptions="FillAndExpand">
        <StackLayout
            Margin="0,60,0,0"
            HorizontalOptions="Center"
            VerticalOptions="StartAndExpand">
            <Image Source="LoginLogo.png" WidthRequest="200" />
        </StackLayout>
        <StackLayout Style="{StaticResource NoSpaceStack}" VerticalOptions="EndAndExpand">
            <StackLayout>
                <Entry
                    HorizontalOptions="FillAndExpand"
                    Keyboard="Chat"
                    Style="{StaticResource SignUpTextBoxDefault}"
                    Text="{Binding UserName}">                   
                    <Entry.Behaviors>
                        <behaviors:TextChangedBehavior Command="{Binding OnTextChangedCommand}" EventName="TextChanged" />
                        <behaviors:TextChangedBehavior
                            Command="{Binding OnNextCommand}"
                            CommandParameter="{Binding ., Source={x:Reference PasswordEntry}}"
                            EventName="Completed" />
                    </Entry.Behaviors>
                </Entry>
            </StackLayout>
            <StackLayout>
                <StackLayout
                    HorizontalOptions="FillAndExpand"
                    Orientation="Horizontal"
                    Style="{StaticResource NoSpaceStack}">
                    <Entry
                        HorizontalOptions="FillAndExpand"
                        IsPassword="True"
                        Keyboard="Chat"
                        Style="{StaticResource SignUpTextBoxDefault}"
                        Text="{Binding Password}">                      
                        <Entry.Behaviors>
                            <behaviors:TextChangedBehavior Command="{Binding OnTextChangedCommand}" EventName="TextChanged" />
                            <behaviors:TextChangedBehavior
                                Command="{Binding OnNextCommand}"
                                CommandParameter="{Binding ., Source={x:Reference BtnLogin}}"
                                EventName="Completed" />
                        </Entry.Behaviors>
                    </Entry>
                </StackLayout>
            </StackLayout>         
                <StackLayout.Margin>
                    <OnPlatform
                        x:TypeArguments="Thickness"
                        Android="0,0,0,0"
                        iOS="0,5,0,5" />
                </StackLayout.Margin>
                <controls:Checkbox
                    CheckedImage="selectedcheckbox.png"
                    IsChecked="{Binding RememberPassword, Mode=TwoWay}"
                    UnCheckedImage="emptycheckbox.png"
                    VerticalOptions="Center">
                    <controls:Checkbox.HeightRequest>
                        <OnPlatform
                            x:TypeArguments="x:Double"
                            Android="80"
                            iOS="20" />
                    </controls:Checkbox.HeightRequest>
                </controls:Checkbox>
                <Label
                    Style="{StaticResource SignUpLabelSpelDefault}"
                    Text="Remember password"
                    VerticalOptions="Center"
                    VerticalTextAlignment="Center" />
                <Label
                    HorizontalTextAlignment="Center"
                    Style="{StaticResource SignUpLabelSpelBlue}"
                    Text="Forgot/Reset"
                    VerticalTextAlignment="Center">
                    <Label.GestureRecognizers>
                        <TapGestureRecognizer Command="{Binding ResetMeCommand}" />
                    </Label.GestureRecognizers>
                </Label>
            </StackLayout>
            <StackLayout>
                <Button
                    BorderRadius="0"
                    Command="{Binding OnLoginCommand}"
                    HorizontalOptions="FillAndExpand"
                    IsEnabled="{Binding EnableLogin}"
                    Style="{StaticResource BlueButtonSofia}"
                    Text="Login" />
            </StackLayout>
            <StackLayout
                Margin="0,20,0,20"
                HorizontalOptions="Center"
                Orientation="Horizontal">
                <Label
                    HorizontalTextAlignment="Center"
                    Style="{StaticResource SignUpLabelSpelDefault}"
                    Text="New to Openpay?" />
                <Label
                    HorizontalTextAlignment="Center"
                    Style="{StaticResource SignUpLabelSpelBlue}"
                    Text="Create account">
                    <Label.GestureRecognizers>
                        <TapGestureRecognizer Command="{Binding SignUpCommand}" />
                    </Label.GestureRecognizers>
                </Label>
            </StackLayout>
        </StackLayout>

    </StackLayout>
</ContentPage>