Replacing ComboBox With ImageCombo!

In a WebBrowser project, I want to add those URLs in the address bar ImageCombo which the user types. Such URLs are saved in a text file so that they can be populated in the address bar when the browser starts next time. Also it has to be ensured that URLs that are already listed in the address bar shouldn't get listed again i.e. there shouldn't be any duplicates. This is how I tried it:

VB Code:

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As Any) As Long
 
'the [b]ImageCombo[/b] has an index of 0
Private Sub [b]imgCboURL_KeyDown(Index As Integer, KeyCode As Integer, Shift As Integer)[/b]
    If (KeyCode = vbKeyReturn) Then
        '[u]Call cboURL_Click(0)[/u]
        Call imgCboURL_Click(0)
    End If
End Sub
Private Sub [b]imgCboURL_Click(Index As Integer)[/b]
    '[u]Call AddToCombo(cboURL(0).Text, cboURL(0))[/u]
    Call AddToCombo(imgCboURL(0).Text, imgCboURL(0))
End Sub
'[u]Private Sub AddToCombo(pstrComboItem As String, pCB As ComboBox)[/u]
Private Sub [b]AddToCombo(pstrComboItem As String, pCB As ImageCombo)[/b]
    On Error Resume Next
    Dim lngComboIndex As Long
    Dim objNewComboItem As ComboItem
    
    If (InStr(pstrComboItem, "http://") = 0) Then
        'if the user hasn't typed http:// in the address bar, append it
        pstrComboItem = "http://" & pstrComboItem
    Else
        'else leave the URL as it is
        pstrComboItem = pstrComboItem
    End If
    lngComboIndex = SendMessage(pCB.hwnd, CB_FINDSTRING, -1, ByVal pstrComboItem)
    If (lngComboIndex = -1) Then
        Set objNewComboItem = pCB.ComboItems.Add(1, , pstrComboItem, 2)
        [u]'pCB.AddItem pstrComboItem[/u]
        Dim iFile As Integer
        Dim FileName As String
        
        iFile = FreeFile
        FileName = App.Path & "\TypedURLs.txt"
        Open FileName For Append As #iFile
            Write #iFile, pstrComboItem
        Close #iFile
    End If
End Sub

Earlier I was using a ComboBox as the address bar. The changes I have made to the above-mentioned code when I replaced the ComboBox with the ImageCombo are the underlined commented lines (of course, plus the code to populate the ImageCombo).

The problem is the above code worked perfectly when I was using the ComboBox but the same isn't happening when I changed to the ImageCombo. Using the ImageCombo, URLs that are already listed in the ImageCombo address bar are getting listed again & again if such a URL is typed again by the user. I didn't face this problem when I was using the ComboBox.

Can someone please point out where am I erring?