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in an ie toolbar I am trying to disable a button, I have added the ON_COMMAND handler but it only seems to be called (disabled) when I click the button, How can I force the update to be called?

I have tried:

GetParent()->SendMessage(WM_COMMAND, MAKELONG(ID_AUTOFILL_PASSCODE, BN_PAINT), (LPARAM)m_hWnd);

but this does not seem to do the trick...

You can invoke the command updating mechanism for a particular toolbar window with one line of code:

pToolBar->OnUpdateCmdUI( pTargetWnd, TRUE );

pTargetWnd specifies the command target window which has a command handler/updating method for your toolbar commands.

What about when the toolbar is not a child of a CFrameWnd as in a IE toolbar?

There is no difference. The CExtToolControlBar::OnUpdateCmdUI() method works in any type of project.

The method has the signature:

    virtual void OnUpdateCmdUI(
        CFrameWnd * pTarget,
        BOOL bDisableIfNoHndler
        );

I am not sure how to pass a non-frame wnd (CWnd) into this?

You can update all the toolbar buttons with the following code:

CWnd * pTargetUpdateWnd = . . .
CExtToolControlBar * pToolBar = . . .
BOOL bDisableIfNoHndler = TRUE;
int nBtnIdx, nCountOfButtons = pToolBar->GetButtonsCount();
    for( nBtnIdx = 0; nBtnIdx < nCountOfButtons; nBtnIdx++ )
    {
        CExtBarButton * pTBB = pToolBar->GetButton( nBtnIdx );
        ASSERT_VALID( pTBB );
        pTBB->OnUpdateCmdUI(
            pTargetUpdateWnd,
            bDisableIfNoHndler,
            nBtnIdx
            );
    }