显示为粗体VB属性网格的默认值

Question

当您在VB中执行属性网格并为字段分配值（默认值除外）时，它会将其显示为粗体。但是，即使我将其设置为默认值，我也会将值显示为粗体。任何人都知道是什么导致了这个？当我使用双数据类型时似乎总是会发生。这是我的代码。我有构造类实例的属性定义和构造函数。感谢。

Private _FisheyeAngle As Double
    <DataMember()>
    <DisplayName("Fisheye Angle")>
    <Description("This value indicates the angle used in the fisheye view, if it is enabled.  The acceptable range is 45 to 360 degrees with 180 degrees being the default. ")>
    <DefaultValue(180)>
    Public Property FisheyeAngle As Double
        Get
            Return _FisheyeAngle
        End Get
        Set(value As Double)
            If value < 45 Then
                _FisheyeAngle = 45
            ElseIf value > 360 Then
                _FisheyeAngle = 360
            Else
                _FisheyeAngle = value
            End If
        End Set
    End Property


    Private Sub Initialize()


        Width = 800
        Height = 600
        FisheyeAngle = 180
        ToneCompressionRate = 1

    End Sub