Hi, I'm developing a user control called SearchBox, that will act as a replacer for ComboBox for multiple records, as the performance in ComboBox is low for this scenario, but I'm having a big binding problem. I have a base control with a DependencyProperty called SelectedItem, and my SearchControl shows that control so that the user can select the record. The SearchControl also has a DependencyProperty called SelectedItem on it, and it is being updated when the user selects something on the base control, but the UI, wich has the SearchControl, is not being updated. I used a null converter so that I could see if the property was updating, but it's not. Below is some of the code: This is the UI:

                        <NectarControles:MaskedSearchControl x:Name="teste"
                                                         Grid.Row="0"
                                                         Grid.Column="1"
                                                         Height="21"
                                                         ItemsSource="{Binding C001_Lista}"
                                                         DisplayMember="C001_Codigo"
                                                         Custom:CustomizadorTextBox.CodigoCampo="C001_Codigo"
                                                         ViewType="{x:Type C001:C001_Search}"
                                                         ViewModelType="{x:Type C001_ViewModel:C001_ViewModel}"
                                                         SelectedItem="{Binding Path=Instancia.C001_Holding, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource DebuggingConverter}}">
                    </NectarControles:MaskedSearchControl>

This is the relevante part of the SearchControl:

            Binding selectedItemBinding = new Binding("SelectedItem");
                    selectedItemBinding.Source = this.SearchControlBase;
                    selectedItemBinding.Mode = BindingMode.TwoWay;
                    selectedItemBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;

                    this.SetBinding(SelectedItemProperty, selectedItemBinding);

...

        public System.Data.Objects.DataClasses.IEntityWithKey SelectedItem
    {
        get
        {
            return (System.Data.Objects.DataClasses.IEntityWithKey)GetValue(SelectedItemProperty);
        }
        set
        {
            SetValue(SelectedItemProperty, value);

            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("SelectedItem"));
        }
    }

Please someone help me... Tks...