Disable textboxes if Combobox is not selected first

Hi puuts

Eliminate this Code

'Private Sub ComboBox1_Exit(ByVal Cancel As MSForms.ReturnBoolean)

'If Me.ComboBox1.ListIndex = -1 Then
'        MsgBox "Please select a month", vbExclamation + vbCritical, "Error"
'        Cancel = True
'        Exit Sub
'    End If
'End Sub

Add this Code for each TextBox

Private Sub TextBox1_Enter()
    If Me.ComboBox1.ListIndex = -1 Then
        MsgBox "Please select a month", vbExclamation + vbCritical, "Error"
        Me.ComboBox1.SetFocus
        Exit Sub
    End If

End Sub

Similar idea, I would use the _Change event of the prior form controls to enable/disable the coming controls. This way they are all visible, but greyed out until appropriate

Private Sub ComboBox1_Change()
    CheckBox1.Enabled = Len(ComboBox1) > 0
End Sub