CommonControls (Replacement of the MS common controls)

[Krool]

I have a kind of 'solution'.
In the ListBoxW source, I added a DoEvents on WM_KILLFOCUS:

Private Function WindowProcControl(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Select Case wMsg
    Case WM_SETFOCUS
        If wParam <> UserControl.hWnd Then SetFocusAPI UserControl.hWnd: Exit Function
        Call ActivateIPAO(Me)
    Case WM_KILLFOCUS
        Debug.Print "WM_KILLFOCUS"
        DoEvents
        Call DeActivateIPAO
    Case ...

This fixes the flickering completely.
I'm not sure yet if there are side effects from this addition.

Later:
I don't feel fine with the DoEvents.
So I tried this:

    Case WM_KILLFOCUS
        Debug.Print "WM_KILLFOCUS"
        Call DeActivateIPAO
        Exit Function

Exit Function cures the flicker as well.

It is also happening "sometimes" in the VB6 ListBox when using visual styles. So, I get the feeling that this is something to do with the underlying API window class and not specific with VBCCR.
Of course when somebody can provide a clever solution it would be good. To just cancel out WM_KILLFOCUS sounds like getting side-effects.