Question User-Control Property Binding problem

[imanedrisian]

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

With this code everything is just fine except that when i made change to my control "value" property, 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