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Code broken: 'editValue null error

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Visual Studio 2013/4 FrameWork 4.0 Windows Forms

Installed package with NuGet.

Added required references.

Tried out your Example1 Dictionary of type string/string on both a Form, and a Component inheriting from TextBox:
  1. the Dictionary appears as expected in the property grid, and the design-time editor opens.
  2. clicking 'Add puts up a messagebox: "Value cannot be null. Parameter Name: EditValue."
  3. this messagebox is repeated if you click 'Cancel to dismiss the editor.

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