public override void OnValueChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
if (!(sender is TextBox textbox))
{
return;
}
textbox.TextChanged -= Textbox_TextChanged;
if ((bool)e.NewValue)
{
HasTextAttachedProperty.SetValue(textbox);
textbox.TextChanged += Textbox_TextChanged;
}
}
private void Textbox_TextChanged(object sender, TextChangedEventArgs e)
{
HasTextAttachedProperty.SetValue((TextBox)sender);
}
