I am having a wierd problem with an exception on one of my combo boxes.  
Not sure why I didn't notice it before, but I see it now after I re-enabled 
catching all CLR exceptions when thrown.

I am getting this exception :
        "Value cannot be null. \n Paramter name:handler"
        @at System.ComponentModel.ReflectPropertyDescriptor.-
                AddValueChanged(Object component, EventHandler handler)

with the following code on the last line, where I assign it as a datasource. 
 I seem to have the problem even in the immediate window when I do "new BindingSource(n,Nothing)" 
or "new BindingSource(n,"")", or anything else.  I can just ignore the exception 
and everything functions as expected :

        Dim n As New System.Collections.Generic.Dictionary(Of Integer, String)
        For i As Integer = 2007 To DateTime.Now.Year
            n.Add(i, i.ToString)
        Next        

        comboYear.DataSource = New BindingSource(n, Nothing)


Any ideas why this could be happening, or a way around it.  I see many examples 
of doing it this way, and no one has complained.  I also can not seem to 
find any reference to this exact error through google, but that could just 
broken fingers.

Thanks,

// Andrew