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Hi all.
I’m using print preview functionality from CExtPPVW template class
for display database report directly in print preview mode.
All works fine, but i need add some button to to CExtPPVW_ToolBar
embedded in CExtPPVW_HostWnd for manage other operation,
such as export in some format, reload report, ecc.
How can I add other buttons to toolbar and how I manage
events fired from this new buttons?
Thanks in advace.

I found a solution myself.
I created CMyExtPPVW_HostWnd : public CExtPPVW_HostWnd
and in this I added new message map entries with
ON_COMMAND and ON_UPDATE_COMMAND_UI macros.
Then, in command handlers, I forwarded my button’s message to
my CExtPPVW < CScrollView > using m_pPpvPrintable pointer.

In CExtPPVW < CScrollView > I overrided OnCmdMsg and added
this snippet:

    switch( nCode )
    {
    case CN_COMMAND:
        switch( nID )
        {
...
        case ID_FILE_PRINT_PREVIEW:
            CExtPaintManager::stat_PassPaintMessages();
            if( m_bPrintPreviewEnabled && IsPrinterAvailable() )
            {
                if( m_bPrintPreviewCheckMarkCmdStyle &&    m_pWndPP->GetSafeHwnd() != NULL )
                    m_pWndPP->OnPreviewClose();
                else
                    CExtPPVW_Printable::DoPrintPreview( true, false, RUNTIME_CLASS(CMyExtPPVW_HostWnd) );
            }
            return TRUE;
...
        }
        break;
    }

for using my CExtPPVW_HostWnd derived class.

So, with others little adjustment, now all work fine.
In any case, thanks for yuor interest.

Thanks for response, but I have some problem for implementing it.
I’m using CExtPPVW < CScrollView > and I overrided
CExtPPVW_Printable::OnInitializePrintPreviewToolBar()
function and added my buttons in toolbar.
My buttons, of course, are disabled.
Now, I want to handle CN_COMMAND and CN_UPDATE_COMMAND_UI
in my class, ma my buttons doesn’t send WM_COMMAND to my
CExtPPVW < CScrollView >. I experimented with OnCmdMsg and with
ON_UPDATE_COMMAND_UI and ON_COMMAND macro, but noone works.
What is the simpler solution to this message routing problem?

Thank you for the interesting question. You should override the CExtPPVW_Printable::OnInitializePrintPreviewToolBar() virtual method in a CExtPPVW < CExtGridWnd > - derived class (or in a CExtPPVW < CExtTreeGridWnd > - derived class, or yet in a CExtPPVW < CExtReportGridWnd > - derived class). Your method should invoke the parent class method and then modify content of the CExtPPVW_Printable::m_pWndPP->m_pPpvWndToolBar toolbar. You can also implement the CExtPPVW_Printable::OnInitializePrintPreviewToolBar() toolbar from scratch using source code of original method. Your custom commands in this toolbar should be handled/updated in your CExtPPVW < CExtGridWnd > - derived class.