While using entity as Dependency in Silverlight, two way bindings will not update the values of a Text Boxes in XAML

While using entity as Dependency in Silverlight, two way bindings will not update the values of a Text Boxes in XAML

I have created a control and placed that control on the page. Created a dependency property like below:

public Test CtrlTest{             get {return (Test)GetValue(CtrlTestProperty);}             set { SetValue(CtrlTestProperty, value);}         } public static readonly DependencyProperty CtrlTestProperty=   DependencyProperty.Register("CtrlTest", typeof(Test), typeof(Nameofcontrl),  null); 

where test is the poco entity.Now i have binded the dependency property in Xaml code.like

<TextBox x:Name="testbox" Text="{Binding CtrlTest.ABD,Mode=TwoWay}"/>; 

But while i m updating the depency property on the control as below

CtrlTest.abc="dfgfdgfd"; CtrlTest.cdf=""; 

It will not update the bindings in XAML.
Can anyone help me regarding this.
When I will take the local property on the page and bind that, it will updating smothly.
But not Entity.
Thanks in Advance.............

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