When using the type "Keys" for a class/custom component, how can I set the "Default" attribute?

I've created my own custom component for using with a barcode scanner. Two of my properties are "ScanPreamble" and "ScanPostamble" and I want the default values to be "F8" and "F9" respectively.

Unfortunately, when I create an instance of this component, both properties are set to "None". I've tried the following and none of this works:

<DefaultValue(GetType(Keys), "Keys.F8")> _

<DefaultValue(GetType(Keys), "F8")> _

<DefaultValue(119)> _

Much obliged to whoever helps me fix this.

Dim keyScanPreamble As Keys
    Dim keyScanPostamble As Keys
 
<Category("Details")> _
    <Description("Key used to start a scan - Preamble")> _
    <DefaultValue(GetType(Keys), "Keys.F8")> _
    Public Property ScanPreamble() As Keys
        Get
            Return keyScanPreamble
        End Get
        Set(ByVal value As Keys)
            keyScanPreamble = value
        End Set
    End Property
 
    <Category("Details")> _
    <Description("Key used to end a scan - Postamble")> _
    <DefaultValue(GetType(Keys), "Keys.F9")> _
    Public Property ScanPostAmble() As Keys
        Get
            Return keyScanPostamble
        End Get
        Set(ByVal value As Keys)
            keyScanPostamble = value
        End Set
    End Property

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