DataMember property 'FK_Phone_Customer' cannot be found on the DataSource.

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C#

Windows

C#4.0

My problem is not with the application, it is Visual Studio.
The problem is that when I open a Form.cs[Design] window in Visual Studio; the above error appears instead of showing design mode of a Form.

Let me explain what project it is:
In order to encapsulating codes I have a WindowsForm named "CRUD" which other Forms inherit form.

"CRUD" has these controls:
1. DataSet
2. TableAdapterManager
3. MasterBindingSource

"CustomerUI" which inherits from "CRUD" has these controls:
1. CustomerTableAdapter
2. PhoneTableAdapter
3. DetailBindingSource
Plus two DataGridView.

(Note: The DataSource property of DetailBindingSource is MasterBindingSource & the DataMember is 'FK_Phone_Customer'.)
With these stuffs I have made a master-Detail form correctly; But I do not realize
the error.
I say it again; Application is working with no error.
What should I do to disappearing the error?