How do I add items to a user control through string collection editor.

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VB

I am trying to create an user control very very similar to Combo Box. In user application I have added the control, in design mode the string collection editor opens up by clicking the Eclipse. I add few lines. How do I retrieve these values. What happens when OK button is clicked or cancel button of string editor's is clicked. See, Items property is having Get and Set. How to set the items from string collection editor.

What I have tried:

<DesignerSerializationVisibility(DesignerSerializationVisibility.Content)> _
    <Editor("System.Windows.Forms.Design.StringCollectionEditor, System.Design", "System.Drawing.Design.UITypeEditor, System.Drawing")> _
    <Browsable(True)> _
    Public Property Items() As Collection
        Get
            Return P1Value
        End Get
        Set(ByVal value As Collection)
            For Each Str As String In value
                Me.Items.Add(CType(Str, String))
            Next
            P1Value = value
            AddItemsOnForm(P1Value)
        End Set
    End Property

    Private Sub AddItemsOnForm(ByVal MC As Collection)
        For I As Integer = 1 To P1Value.Count
            Dim MyLabel As New Label
            With MyLabel
                .Text = P1Value.Item(I)
                .Top = MTop
                .Left = 1
                MsgBox("Item = " & P1Value.Item(I))
            End With
            MyForm.Controls.Add(MyLabel)
            MTop = MTop + 14
        Next
    End Sub