Dynamic checkbox to enable textbox

I have a problem about dynamic controls. I create a dynamic userform with single frames depending by a number (rngprt in my example dependent by user input). No problem till now. Now I want to enable a textbox (in order to change its value) inside a specific frame when the relative checkbox is click. I used a Class Module (Classe1), but with my code I succeeded only to enable the last textbox of the n-frames when its checkbox is clicked (e.g. if I have 3 frames with 3 textboxes and 3 checkboxes, only the third checkbox it's able to enable the third textbox, the first and the second don't work).

Class Module: Classe1

Option Explicit
Public WithEvents cmbEvent1 As MSForms.CommandButton
Public WithEvents txbEvent1 As MSForms.TextBox
Public WithEvents frmEvent1 As MSForms.Frame
Public WithEvents ckbEvent1 As MSForms.CheckBox

Private Sub cmbEvent1_Click()
UserForm3.Hide
End Sub

Private Sub frmEvent1_Click()
End Sub

Public Sub txbEvent1_Change()
End Sub

Private Sub ckbEvent1_Click()
If UserForm3.Controls("CK" & xx).Value = True Then
UserForm3.Controls("TB" & xx).Enabled = True
End If
End Sub

Module: UserForm3

Option Explicit
Dim cmdB As New Classe1
Dim txtB As New Classe1
Dim chkB As New Classe1
Dim frm As New Classe1
Dim chkBColl As New Collection

Private Sub UserForm_Initialize()
Dim x As Long
Dim c As Variant
Dim cmdB1 As MSForms.CommandButton
Dim frm1 As MSForms.Frame
Dim txtB1 As MSForms.TextBox
Dim chkB1 As MSForms.CheckBox

Set cmdB1 = UserForm3.Controls.Add("Forms.CommandButton.1")
       With cmdB1
            .Name = "OKButton"
            .Caption = "OK"
            .Top = 40 * rngprt
            .Left = 120
            .Width = 40
            .Height = 25
       End With
       Set cmdB.cmbEvent1 = cmdB1

For x = cel.Row To cel.Row + rngprt - 1 '**rngprt is a number from a Module1**

xx = x - cel.Row + 1  '**for progessive name of controls Dim xx as long into the Module1**

Set frm1 = UserForm3.Controls.Add("Forms.Frame.1")
            frm1.Top = 40 * (xx - 1)
            frm1.Left = 10
            frm1.Width = 300
            frm1.Height = 35
            frm1.Name = "FR" & xx

With frm1.Controls

Set txtB1 = .Add("Forms.TextBox.1")
       With txtB1
            .Name = "TB" & xx
            .Top = 10
            .Left = 160
            .Width = 30
            .Height = 15
            .TextAlign = fmTextAlignRight
            .Enabled = False
            .Value=50
       End With
       Set txtB.txbEvent1 = txtB1

     Set chkB1 = .Add("Forms.CheckBox.1")
       With chkB1
            .Name = "CK" & xx
            .Caption = "Part"
            .Top = 10
            .Left = 245
            .Width = 45
            .Height = 15
       End With
       Set chkB.ckbEvent1 = chkB1
       'Here I added the code below

End With
       Set frm.frmEvent1 = frm1
Next x

End Sub

I tried also to add this code below the chkB1 setting, but nothing.

       Set chkB = New Classe1
       Set chkB.ckbEvent1 = Me.Controls(chkB.txbEvent1)
       chkBColl.Add chkB

Anybody have idea. Thank in advance to all for help.