WPF textbox text binding to a ViewModel's property
===

I have a problem with two way binding a TextBox content to a property in another class. Searching stackoverflow gave a lot of tips/solutions but none seem to work.

In my XAML code I have:    

    < TextBox ... Width="336" IsReadOnly="True"
     Text="{Binding Path=AssignedClearProgram, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>

(... I removed all non important items)

In the accompanies cs code I have:

    public CombiWindow(Combi combi)
    {
        ViewModel = new CombiViewModel(combi);
        DataContext = ViewModel;
    }

In the CombiViewModel:
    
        [UsedImplicitly]
        public string AssignedClearProgram { get; set; }

It seems that the first time I assign AssignedClearProgram, the textbox is filled with the text that I set, however after the window is displayed and AssignedClearProgram gets updated from the code (i.e. the set method is called), the data is not updated in the screen.

Does anybody have a solution to update the textbox when this variable is changed?

Kind regards,

Michel
    

