problem using monthcalendar

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VB

On clicking a text box, I have pop-upped a calendar within a form. But I am not able navigate (i.e. change the months) by using the Previous/Next buttons of the calendar. Is this a setup problem ? Please suggest.....

the code is as follows :

Private Sub labrefdt_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles labrefdt.KeyPress
        If Asc(e.KeyChar) = Keys.Enter Then
            If Len(labrefdt.Text) = 0 Then
                labrefdt.Enabled = False
                selcalendar.Show()
                selcalendar.Focus()
                selcalendar.ShowTodayCircle = True
                selcalendar.ScrollChange = 1
            Else
                labrefdt.Enabled = False
                labrefdt.Text = Format("dd/MM/yyyy")
                GroupBox2.Enabled = True
                patname.Enabled = True
                patadd.Enabled = True
                patsex.Visible = False
                malebutton.Visible = True
                femalebutton.Visible = True
                patname.Text = ""
                patname.Focus()
                patcontact.Enabled = True
                patreference.Enabled = True
            End If
        End If
    End Sub

Also how to put the selected date from the calendar into a text box.