WPF isn't binding ComboBox SelectedItem

Question

I already search widely, but I can't find any solution to my case.

I have several ComboBox's at my project and I was searching for an AutoComplete solution, then I found a good one and applied in my project, I applied solution's style as well to all ComboBox in my project.

After that, SelectedItem stopped working, some one can help me ?

My Combobox:

My style:

UPDATE

My ToggleButton

My TextBox

Some, please, can help me ?

UPDATE 2

Found a hack, not the perfect solution, but kind of works...

If I insert property SelectedValue and the value Owner.OwnerTypeId, it works like a charm... But, it's right this?

My Combobox now:

This is a solution, not that I like it, but it's a solution... Some one can answer why SelectedItem isn't working as it should ?

Obs.: When I change the selection, SelectedItem works, just doesn't work when I load my view.

UPDATE 3

Ok, it's worked like I said, but the problem is that WPF is hitting 4 times at my ViewModel, so I changed my ComboBox a little:

So, now, WPF just search the OwnerTypeId and when I change an item, WPF just hits 2 times.

UPDATE 4

Ok, another strange finding... In another ComboBox, with the same properties, except SelectedValue, it's working perfect... I can't understand what is happening.

UPDATE 5

Sorry about that, I forgot to post my models.

Model Owner:

public class Owner
{
    public int Id { get; set; }
    public int OwnerTypeId { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
    public string FormatedPhone
    {
        get
        {
            if (this.Phone == null)
                return string.Empty;

            switch (this.Phone.Length)
            {
                case 11:
                    return Regex.Replace(this.Phone, @"(\d{2})(\d{4})(\d{4})", "($1) $2-$3");
                case 12:
                    return Regex.Replace(this.Phone, @"(\d{2})(\d{5})(\d{4})", "($1) $2-$3");
                default:
                    return this.Phone;
            }
        }
    }
    public string Phone { get; set; }
    public string CellPhone { get; set; }
    public string FormatedCellPhone
    {
        get
        {
            if (this.CellPhone == null)
                return string.Empty;

            switch (this.CellPhone.Length)
            {
                case 11:
                    return Regex.Replace(this.Phone, @"(\d{2})(\d{4})(\d{4})", "($1) $2-$3");
                case 12:
                    return Regex.Replace(this.Phone, @"(\d{2})(\d{5})(\d{4})", "($1) $2-$3");
                default:
                    return this.CellPhone;
            }
        }
    }
    public string Email { get; set; }
    public virtual OwnerType OwnerType { get; set; }
    public virtual ICollection Animals { get; set; }

    public Owner()
    {
        this.OwnerType = new OwnerType();
        this.Animals = new List();

        this.ErrorList = new StringBuilder();
    }

Model OwnerType:

public class OwnerType
{
    public int Id { get; set; }
    public string Name { get; set; }
    public virtual ICollection Owners { get; set; }

    public OwnerType()
    {
        this.Owners = new List();
    }
}

WPF isn't binding ComboBox SelectedItem

3 Answers