VBA ComboBox Change Event not triggered - excel

Question

I have this issue with the ComboBox Event Handler.
I managed to create (and fill with items) the Comboboxes I wanted, the code seems to work fine. But after the program has run, if I try to pick one general item inside one of the comboboxes, it seems like the _Change Method is not called --> I cannot handle change events.
Here is my class module (class name: "DB_ComboBox")
Option Explicit
Public WithEvents DB_ComboBoxEvents As MSForms.ComboBox
Private DB_ComboBox_Line As Integer
Private Sub DB_ComboBoxEvents_Change()
MsgBox ("Line : " & DB_ComboBox_Line)
'Here I want handle The comboboxes changes
'But this routine is not called!
End Sub
Sub Box(CBox As MSForms.ComboBox)
Set DB_ComboBoxEvents = CBox
End Sub
Public Property Let Line(value As Integer)
DB_ComboBox_Line = value
End Property
Public Property Get Line() As Integer
Line = DB_ComboBox_Line
End Property
And here is my "Main module", in which I create the comboboxes and pass them to a Collection of "DB_ComboBox"
Sub CreateComboBox(IncCBoxes)
Dim curCombo As MSForms.ComboBox
Dim rng As Range
Dim tot_items As Integer
Dim incAddItem As Integer
Dim incAddItemBis As Integer
Dim itemBaseArray() As String
Dim TEMP_ComboBoxInst As New DB_ComboBox
Set rng = ActiveSheet.Range("J" & IncCBoxes)
Set curCombo = ActiveSheet.OLEObjects.Add(ClassType:="Forms.ComboBox.1", Link:=False, DisplayAsIcon:=False, Left:=rng.Left, Top:=rng.Top, Width:=rng.Width, Height:=rng.Height).Object
'Add the items
itemBaseArray = Split(Foglio7.Cells(IncCBoxes, DBColFileComboIndexErrori), ";")
For incAddItem = 0 To UBound(itemBaseArray)
Dim itemLastArray() As String
itemLastArray = Split(itemBaseArray(incAddItem), ",")
For incAddItemBis = 0 To UBound(itemLastArray)
curCombo.AddItem (itemLastArray(incAddItemBis))
Next
Next
TEMP_ComboBoxInst.Box curCombo
TEMP_ComboBoxInst.Line = IncCBoxes
customBoxColl.Add TEMP_ComboBoxInst
End Sub
Can anyone please tell me what I'm missing?
Thank you very much

Answer 1

This looks like a timing-issue:
Running this code in another open file will work. In same file it does not.
Seperate the adding to your class from the adding of the OLEControl i.e.:
use Application.ontime now
see code below:
Private customBoxColl As New Collection
Sub CreateComboBox(IncCBoxes As Long)
Dim curCombo As MSForms.ComboBox
Dim rng As Range
Dim tot_items As Integer
Dim incAddItem As Integer
Dim incAddItemBis As Integer
Dim itemBaseArray() As String
Dim itemLastArray() As String
Set rng = ActiveSheet.Range("J" & IncCBoxes)
With ActiveSheet.OLEObjects.Add(ClassType:="Forms.ComboBox.1", Link:=False, DisplayAsIcon:=False, Left:=rng.Left, Top:=rng.Top, Width:=rng.Width, Height:=rng.Height)
Set curCombo = .Object
End With
'Add the items
itemBaseArray = Split(Foglio7.Cells(IncCBoxes, DBColFileComboIndexErrori), ";")
For incAddItem = 0 To UBound(itemBaseArray)
itemLastArray = Split(itemBaseArray(incAddItem), ",")
For incAddItemBis = 0 To UBound(itemLastArray)
curCombo.AddItem (itemLastArray(incAddItemBis))
Next
Next
Application.OnTime Now, "'CallToClass """ & curCombo.Name & """,""" & IncCBoxes & "'"
End Sub
Sub CalltoClass(ctl As String, myline As Long)
Dim TEMP_ComboBoxInst As New DB_ComboBox
TEMP_ComboBoxInst.Box ActiveSheet.OLEObjects(ctl).Object
TEMP_ComboBoxInst.line = myline
customBoxColl.Add TEMP_ComboBoxInst
End Sub

Answer 2

I know this doesn't apply to your specific problem, but I'll just post this here for any others who may have this problem. In my case, the events stopped firing because I had just copied my database into a new Github repo.
On reopening Access, the events weren't firing while they had been fine the day before, which completely stumped me, especially since none of the SO answers seemed to address my issue. Basically, Access blocks macros and code, and requires it to be reenabled by clicking OK on the little yellow warning at the top of the screen.