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From: Derek Evan (derek_at_tidalsoft.com)
Date: 05/13/04 

Date: Thu, 13 May 2004 14:44:10 -0700

When previewing a multiple page document, the toolbar buttons are not
enabling/disabling correctly.

For example, if I choose Next to get to page 2, the Prev button does not get
enabled for me to go back to page 1. Similarly, if I Zoom In, the Zoom Out
button does not get enabled. It would appear that the ON_UPDATE_COMMAND_UI
message handlers are not being called when they should. Any ideas on how to
resolve this?

In the MFC source code for preview, I see that the following message map is
set up, but the handlers do not seem to get called when they should.
 ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_NEXT, OnUpdateNextPage)
 ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_PREV, OnUpdatePrevPage)
 ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_ZOOMIN, OnUpdateZoomIn)
 ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_ZOOMOUT, OnUpdateZoomOut)

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