excel vba can't make Monthview visible

[madi]

Hi
I put a monthview in my form. The button "mthvsiblecmd" used to make it visible does'nt work (see below) why???

************************
Private Sub Startdate_DateClick(ByVal DateClicked As Date)
Me.Datetb.Value = DateClicked
Startdate.Visible = False

.
Private Sub mthvsiblecmd_Click()
Me.Startdate.Visible = True
End Sub
**************************
I Can't make the monthview visible again

Can anyone help me?
Thanks very much