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Alpha threshold for transparency.
[Visual Basic .NET]
Public Property AlphaThreshold As Double
[C#]
public double AlphaThreshold {get; set;}
[C++]
HRESULT get_AlphaThreshold(
  double threshold
);
[C++]
HRESULT put_AlphaThreshold(
  System.Double* threshold
);
[C++] Parameters threshold [in]
threshold is a parameter of type double threshold [out, retval]
threshold is a parameter of type double*