Why the property is not called on Binding in WPF?

Posted by azamsharp on Stack Overflow See other posts from Stack Overflow or by azamsharp
Published on 2010-04-05T20:13:08Z Indexed on 2010/04/05 20:53 UTC
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I am not sure why the property is not being called on Binding. Here is the code:

<myusercontrol
Text ="{Binding Description, UpdateSourceTrigger=LostFocus,Mode=TwoWay, ValidatesOnDataErrors=True}" 
 IsReadOnly ="{Binding AllowEditing}"
/>

And here is the myusercontrol IsReadOnly property:

 public static DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof (bool),
                                                                                          typeof (
                                                                                              myusercontrol));


        public bool IsReadOnly
        {
            get
            {
                return ((bool) GetValue(IsReadOnlyProperty));
            }

            set
            {
                MessageBox.Show(value.ToString()); 
                SetValue(IsReadOnlyProperty, !value); 
                OnPropertyChanged("IsReadOnly");
            }
        }

The message box is never displayed! Any ideas!

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