Validate Textbox For Date

I have a userform with 5 textboxes. Each textbox looks for certain kinds of user entry...my code has trouble in re-locating the cursor to the SAME textbox after rejecting the user entry. And BTW, ideally the text box would be highlited in this instance.

Private Sub TextBox2_Exit(ByVal Cancel As MSForms.ReturnBoolean)
Dim okstop As Boolean
Dim yesno_continue As Boolean
Dim mytext As String
okstop = False
Do
TextBox2.SetFocus
TextBox2.SelStart = 0
mytext = TextBox2.Value
If Not IsDate(mytext) And mytext <> "" Then
TextBox2.Value = ""
yesno_continue = MsgBox("Please enter a date...try again?", vbYesNo)
TextBox2.SetFocus
Else
okstop = True
End If
Loop Until (yesno_continue = vbNo) Or (okstop = True)
End Sub