According to the example, MVVM binding cannot be implemented and the result after binding cannot be obtained.

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When I run the example using MAUI, I cannot obtain the property value in the ViewModel after the validation is passed. I don't know whether the usage method is wrong or the component has a bug The current version of InputKit. Maui is 4.2 My English is not good, this is the use of machine translation. thank you

  <input:AdvancedEntry
                        Title="account:"                        
                        IconImage="{material:Icon Icon=SupervisorAccount}"                      
                        TitleColor="#000"
                        CornerRadius="5"
                        HeightRequest="90"
                        TextFontSize="18"
                        Margin="0,10,0,0"
                        Padding="0,0,0,0"
                        Placeholder="input account"
                        PlaceholderColor="LightGray"
                        **Text="{Binding UserName}"**
                        TextColor="{AppThemeBinding Light={StaticResource Black}, Dark={StaticResource White}}"
                        ValidationPosition="Before">
                        <input:AdvancedEntry.Validations>
                            <validation:RequiredValidation  Message="must input"/>
                        </input:AdvancedEntry.Validations>
                    </input:AdvancedEntry>

viewmodel
    string userName;
    public string UserName {
            set
            {
                if (userName != value)
                {
                    userName = value;
                    OnPropertyChanged(nameof(UserName));
                }
            }
            get => userName;
        }

async void Submit() { if (!IsValidated) { var result=UserName; ### // After verification, the value of UserName is null }