TemplateBinding dosen't work for property changing

[Supheria]

Hello,
When I use TemplatedControl, property set in its sub-control dosen't call property setter. Like:

---

<!-- MyControl.axml -->
<ControlTemplate>
     <TextBox HorizontalAlignment="Center" Text="{TemplateBinding Text, Mode=TwoWay}" />
</ControlTemplate>

// MyControl.axml.cs
public string Text
{
    get => GetValue(TextProperty);
    set => SetValue(TextProperty, value); // won't be called
}
public static readonly StyledProperty<string> TextProperty =
    AvaloniaProperty.Register<SizeSetter, string>(nameof(Text));

---

<!-- MyControlParent.axml -->
<views:MyControl
    Text="{Binding Text}"
</ControlTemplate>

// MyControlParentViewModel.cs
public string Text
{
    get => _Text;
    set
    {
        // won't be called
        SetProperty(ref _Text, value);
        // some methods
    }
}
string _Text = "Test";

---

In such case, when text of TextBox in MyControl is changed, setter of Text in MyControlViewModel won't be called, however text of TextBox does set to "Test" initially.
How could I make ViewModel's setter working while text of TextBox changed?

[Supheria]

I find my solution: you should add Mode=TwoWay explicitly on 2 locations, whatever the default mode value of Binding is. The solutuion is shown below:

<!-- MyControl.axml -->
<ControlTemplate>
     <TextBox HorizontalAlignment="Center" Text="{TemplateBinding Text, Mode=TwoWay}" />
</ControlTemplate>

<!-- MyControlParent.axml -->
<views:MyControl
    Text="{Binding Text, Mode=TwoWay}" // here must add mode value explicitly
</ControlTemplate>

In such case property in view model will change as TemplatedControl's does.

How strange.

[rabbitism]

you can set default binding mode in property declaration.

[Supheria]

set default binding mode in property declaration

I tried like this:

// MyControl.axml.cs

[Bindable(true, BindingDirection.TwoWay)]
public string Text
{
    get => GetValue(TextProperty);
    set => SetValue(TextProperty, value); // won't be called
}
public static readonly StyledProperty<string> TextProperty =
    AvaloniaProperty.Register<SizeSetter, string>(nameof(Text));

but it doesn't work. How could I set default binding mode in property declaration?

[Supheria]

you can set default binding mode in property declaration.

Ok I Know, thanks a lot. It works like this:

public string Text
{
    get => GetValue(TextProperty);
    set => SetValue(TextProperty, value); // won't be called
}
public static readonly StyledProperty<string> TextProperty =
    AvaloniaProperty.Register<SizeSetter, string>(nameof(Text), "", false, BindingMode.TwoWay); // set here