disable property in property grid contorl

how can you make a property in the property Grid control become disabled at run time. I know that at desing time you can just say something like this in the class you want the grid to display:

VB Code:

<CategoryAttribute("Catagory"), [ReadOnly](True), DescriptionAttribute("Description")> _
    Public Property TestProperty() As Integer
        Get
 
        End Get
        Set(ByVal Value As Integer)
 
        End Set
    End Property

but how can i change the Property Atributes at run time?

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