Data bind to a Shared Property WPF

I have a Class with Shared Properties
This Class holds the Name and ID of the Current User.
It all works fine until I try to databind to the Shared Values.

When I update the Shared Values in Code the Displayed Values stay the same.
But if I update the Displayed Values (In the Text box) the Bound Shared Properties DO update.

Class

Public Class CurrentUser
    Inherits CommonViewModelBase

    Private Shared _name As String = "No Name"
    Private Shared _ID As Integer
    Private Shared _thisInstance As CurrentUser


    Public Shared Property name As String
        Get
            Return _name
        End Get
        Set(value As String)
            _name = value
            _thisInstance.OnPropertyChanged(NameOf(name))
        End Set
    End Property

    Public Shared Property ID As Integer
        Get
            Return _ID
        End Get
        Set(value As Integer)
            _ID = value
            _thisInstance.OnPropertyChanged(NameOf(ID))
        End Set
    End Property

    Protected Sub New()
        'initialization code goes here

    End Sub

    Public Shared Function GetCurrentUser() As CurrentUser
        '
        ' initialize object if it hasn't already been done
        '
        If _thisInstance Is Nothing Then
            _thisInstance = New CurrentUser
        End If
        '
        ' return the initialized instance
        '
        Return _thisInstance
    End Function

End Class

This Property is in the View Model of the Main Window

Public Property localCurrentUser As CurrentUser = CurrentUser.GetCurrentUser

xaml

<StackPanel Orientation="Horizontal" Grid.Row="4" HorizontalAlignment="Right" DataContext="{Binding localCurrentUser}">
            <TextBlock Name="StaffNameTextBlock1" Text="Staff Name (Click to Change) "/>
            <TextBlock x:Name="StaffNameTextBlock" Text="{Binding name, Mode=TwoWay, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}"/>
        </StackPanel>

What am I doing Wrong?