Can you tell me what you mean by "project binding source"? Is it that the project is bound to a source control?
The described behavior sounds as a common issue with the VS designer and I am afraid that without a project that reproducing it I cannot tell what is causing it. However, you can try resolving it by manually deleting the "bin" and "obj" folders, and then Clean, and Rebuild the project. You can also check if the issue is reproducible with the WPF native DataGrid control. In addition, you can take a look at the Output window of Visual Studio and see if there are any errors at runtime.
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