1. You can have an Option group, radio button or anything like that for filtering/not filtering the form:
Code:
Private Sub Toggle_Filter_AfterUpdate()
If Me.Toggle_Filter.value = True Then
Me.FilterOn = True
Else
Me.FilterOn = False
End If
End Sub
Or shortly:
Code:
Private Sub Toggle_Filter_AfterUpdate()
Me.FilterOn = Me.Toggle_Filter.value
End Sub
2. You can add an "All years" entry in the combo:
Code:
Private Sub Combo_Year_AfterUpdate()
If Me.Combo_Year.Value = "All years" then
Me.FilterOn = False
Else
Me.Filter = "Year([Date_Transaction]) = " & Me.Combo_Year.Value
Me.FilterOn = True
End Id
End Sub