I am building wpf edit form, that has two buttons, BeginEdit and Save And the form is bound to ViewModel that inherits from Prism's NotificationObject. There is a property called IsReadOnly And there are two commands that are Prism's DelegateCommands BeginEdit command and save command The code is here

        private DelegateCommand _beginEdit;
    public DelegateCommand BeginEdit
    {
        get
        {
            return _beginEdit ?? (_beginEdit = new DelegateCommand(() => this.IsReadOnly = false
                , () => IsReadOnly));
        }
    }

private bool _isReadOnly; public bool IsReadOnly { get { return _isReadOnly; } set { _isReadOnly = value; RaisePropertyChanged("IsReadOnly"); } }

    private DelegateCommand _saveEdit;
    public DelegateCommand SaveEdit
    {
        get
        {
            return _saveEdit ?? (_saveEdit = new DelegateCommand(() => this.IsReadOnly = true
                , () => !IsReadOnly));
        }
    }

So, as you see, the command will set IsReadOnly property to true or false, and CanExecute should get its value from the same property as well.

It works when I start the form. But after I press BeginEdit, the buttons stays as the same, and the canExecute is not reflecting the new value of IsReadOnly