Hi, I bind BindableCollection from caliburn micro on listbox. Also I bind selected listbox item on property in view model. After I select some item on listbox, property SelectedFriedn which is bind on SelectedItem of listbox is still null.

Code from view model:

     private BindableCollection<UserInfo> _friends;

//bind on listbox
        public BindableCollection<UserInfo> Friends
        {
            get { return _friends; }
            set
            {
                _friends = value;
                NotifyOfPropertyChange(() => Friends);
            }
        }

        private UserInfo _selectedFriend = new UserInfo();

//bind on SelectedItem property of listbox
        public UserInfo SelectedFriend
        {
            get { return _selectedFriend; }
            set
            {
                _selectedFriend = value;
                NotifyOfPropertyChange(() => SelectedFriend);
            }
        }

In view I have this:

    <ListBox Name="Friends" 
             SelectedIndex="{Binding Path=SelectedFriendsIndex,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
             SelectedItem="{Binding Path=SelectedFriend, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
             Style="{DynamicResource friendsListStyle}"
             IsTextSearchEnabled="True" TextSearch.TextPath="Nick"
             Grid.Row="2" 
             Margin="4,4,4,4"
             PreviewMouseRightButtonUp="ListBox_PreviewMouseRightButtonUp"
             PreviewMouseRightButtonDown="ListBox_PreviewMouseRightButtonDown" 
             MouseRightButtonDown="ListBox_MouseRightButtonDown"
             Micro:Message.Attach="[MouseDoubleClick]=[Action OpenChatScreen()]" >

Where can be problem?