WPF ComboBox 将文本绑定到所选项目

Question

I try to bind a ComboBox to a collection:

<ComboBox  Margin="4 0 2 0"
    ItemsSource="{Binding YAxes}"
    SelectedItem="{Binding SelectedYAxis, Mode=TwoWay}"
    DisplayMemberPath="AxisTitle"
    SelectedValuePath="AxisTitle"/>

Everything is fine, except Text of this ComboBox . On selection of item, the setter on SelectedYAxis fires and notifies, that property has been changed:

private IAxis _selectedYAxis;
    public IAxis SelectedYAxis
    {
        get => _selectedYAxis;
        set
        {
            _selectedYAxis = value;
            OnPropertyChanged(nameof(SelectedYAxis));
        }
    }

but the text on ComboBox never changes to the selected items AxisTitle . How to display an AxisTitle of SelectedItem as a text of ComboBox ?

UPD : Text is never shown, even if it's set explicitly:

<ComboBox  Margin="4 0 2 0"
    ItemsSource="{Binding XAxes}"
    SelectedItem="{Binding SelectedXAxis, Mode=TwoWay}"
    DisplayMemberPath="AxisTitle"
    Text="Asdasd"/>

It doesn't set the text of ComboBox to "Asdasd".

UPD 2 : I've changed the things to use DataTemplate, but this didn't work as well:

<ComboBox  Margin="4 0 2 0"
           ItemsSource="{Binding YAxes}"
           SelectedItem="{Binding SelectedYAxis, Mode=TwoWay}"
           ItemTemplate="{StaticResource AxisCBTextTemplate}"/>

And the resource section above:

<DataTemplate x:Key="AxisCBTextTemplate">
    <TextBlock Text="{Binding AxisTitle}"/>
</DataTemplate>

UPD 3 An illustration to what do I mean:

The task of displaying some selected text should be trivial, but it has difficulties.

Answer 1

I've found the root cause of this issue. Each IAxis (it is a SciChart axis object) from XAxes and YAxes is already dispayed on the graph (ie bound). Binding them to other controls (like ListBox) causes an exception: "Must disconnect specified child from current parent Visual before attaching to new parent Visual.", I found it out while trying to bind them to ListBox.

Seemes like ComboBox catches such exceptions and doesn't output StackTrace for any case. In my case this exception was wrapped into NullReferenceException and occurred only on click on a ComboBox, that has no ItemTemplate set. Though I may not be fully correct in details, replacing XAxes and YAxes with collections of strings solves this issue.