What is the C++ syntax for C# "typeof(string)"?

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What is the C++ syntax for "typeof(string)"? I'm patterning after the following line from SourceGrid sample #14.

SourceGrid.Cells.Editors.ComboBox cbEditor = new SourceGrid.Cells.Editors.ComboBox(typeof(string));

I'm trying to setup a SourceGrid text editor in C++. I don't know how to make the constructor in the following statement.

SourceGrid::Cells::Editors::TextBox^ textEditor = gcnew SourceGrid::Cells::Editors::TextBox(???);

[confused]