User Defined Shortcut Keys Fail to Fire Event (In Some Circumstances) - ms-access

Question

I'm working with MS Access 2007. I have an event mapped to a command button, which works as expected when it's clicked. I've also added an ampersand in the caption field for the button command, so users can use shortcut keys (in this case alt+s) to also fire the event.
Here is the command that's executed when the command button is clicked or, depending on which fields are in focus, alt+s is pressed:
Private Sub cmdSearch_Click()
If cmdSearch.Caption = "&Search Mode" Then
cmdDelete.Enabled = False
cmdGotoNew.Enabled = False
cmdMenu.Enabled = False
cmdLicHistory.Enabled = False
cmdComplaints.Enabled = False
cmdAddPrint.Enabled = False
cmdReceipts.Enabled = False
cmdLicensee.Enabled = False
cmdSearch.Caption = "Run &Search"
Me.Filter = "1 = 0"
Me.FilterOn = True
DoCmd.GoToRecord acDataForm, "frmLicense", acNewRec
Detail.BackColor = 12615808
Else
Dim cntrl As Control
Dim strFilter As String
For Each cntrl In Me.Controls
If TypeName(cntrl) = "Textbox" Or TypeName(cntrl) = "Combobox" Then
If Not Len(cntrl) = 0 Then
If Not Len(strFilter) = 0 Then strFilter = strFilter & "and "
strFilter = strFilter & cntrl.ControlSource & " like '*" & cntrl & "*' "
End If
End If
Next
If Not Len(strFilter) = 0 Then
DoCmd.DoMenuItem acFormBar, acEditMenu, acUndo, , acMenuVer70
End If
Me.Filter = strFilter
Me.FilterOn = True
DoCmd.GoToRecord acDataForm, "frmLicense", acFirst
cmdDelete.Enabled = True
cmdGotoNew.Enabled = True
cmdMenu.Enabled = True
cmdLicHistory.Enabled = True
cmdComplaints.Enabled = True
cmdAddPrint.Enabled = True
cmdReceipts.Enabled = True
cmdLicensee.Enabled = True
cmdSearch.Caption = "&Search Mode"
' Detail.BackColor = 12632256
Detail.BackColor = -2147483633 ' Grey
End If
End Sub
However, depending on which fields are in focus, the shortcut keys will fire or not fire. Fields that nested in option groups will fire; fields nested in a tab control will not fire.
Is this behavior expected? This is a form level event, so I'm inclined to say that it's not. Any advice on debugging this would be appreciated.