依赖属性绑定不起作用

Question

我有一个bool类型的依赖项属性

 public static readonly DependencyProperty SControlParamsProperty =
        DependencyProperty.Register(
            "SControlParams",
            typeof(bool),
            typeof(PView),
            new PropertyMetadata(OnShowHideSControlChanged)
            );

和财产：

public bool SControlParams 
    {
        get { return (bool)GetValue(SControlParamsProperty); }
        set
        {
            SetValue(SControlParamsProperty, value);
        }
    }

和绑定

var binding = new Binding("SControlParams");
this.SetBinding(SControlParamsProperty, binding);

和VM中的属性：

bool _sControlParams = false;
    public bool SControlParams
    {
        get { return _sControlParams; }
        set
        {
            _sControlParams = value;
            OnPropertyChanged("SControlParams");
        }
    }

它很棒！

但是当我在VM中更改属性时，绑定工作并在视图中调用OnShowHideSControlChanged。

但是， 当我只将属性的类型更改为MyType时：

public static readonly DependencyProperty SControlParamsProperty =
        DependencyProperty.Register(
            "SControlParams",
            typeof(MyType ),
            typeof(PView),
            new PropertyMetadata(OnShowHideSControlChanged)
            );
public MyType SControlParams 
    {
        get { return (MyType)GetValue(SControlParamsProperty); }
        set
        {
            SetValue(SControlParamsProperty, value);
        }
    }

并在VM中：

MyType _sControlParams = ...;
    public MyType SControlParams
    {
        get { return _sControlParams; }
        set
        {
            _sControlParams = value;
            OnPropertyChanged("SControlParams");
        }
    }

处理程序OnShowHideSControlChanged不再调用..

可能有什么问题？ 感谢