Opens an undo frame, which means that all subsequent calls to AddUndoStep will be considert as a single undo step. Calling UndoLastStep or selecting Undo from the Menu will undo all this steps as a single step. Use the C# "using" construct, since this property supports the IDisposable interface, which closes the undoframe when Dispose is called.

public IDisposable UndoFrame { get; }

Public ReadOnly Property UndoFrame As IDisposable
	Get

public:
property IDisposable^ UndoFrame {
	IDisposable^ get ();
}