User-Control Property Binding problem

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VB

user-controls

Binding

hi I develped custom DateTimepicker in vb.net that users can pick date in persian lanquege with it.
in my main contrl class i have bindable property with name "Value". here is the property code :

<Editor(GetType(TypeEditor), GetType(UITypeEditor)), Browsable(True), _
   Bindable(True)> _
   Public Property Value As String
       Get
           Return _DateValue
       End Get
       Set(ByVal Value As String)
           _DateValue = Value
           Me.Text = Value
           RaiseEvent ValueChanged(Me, New PropertyChangedEventArgs("Value"))
       End Set
   End Property

Whit this code everything is just fine except that when i made change to my control value datasource not updating. but strange part of my problem is that when i change property name to anything else(Like "Dvalue","DateValue"... ) everything working just fine.
sorry for my poor English
Thanks