Commandbar for Word Add-in   

I am working on a Word Add-in in Visual Studio 2005 (C#, .Net2.0). I know 
this is a VB newsgroup, but it is the best i could find.

For this add-in i need a toolbar, which i create using 
'Microsoft.Office.Core.CommandBar'. and '.CommandBarButton'. It does show up 
nice and events are hooked up without a problem.

But I run into problems when I want to change the button state or when 
en/disabling  it. In specific conditions trying to do that will result in a 
COMException. I can't remember the exact exception code, but searching around 
returned an 'object missing' description.

My current theory is, that my references to these buttons become invalid 
after a document change/close/etc. The events are still working though, for 
which i can think of some reasons.
Currently I lookup the buttons on a document change 
('Microsoft.Office.Interop.Word.ApplicationEvents4_DocumentChangeEventHandler') using:
'Microsoft.Office.Interop.Application .. CommandBars.FindControl()'. Which 
is not ideal, since it requires that the captions of the buttons are unique. 
And besides that, it is far from ideal anyway that this seems necessary.

Just like Jens Sauer in 'An AfterCloseEvent' I could use such an event too. 
For now I'm just using the BeforeClose event, and mimic the 'do you want to 
safe' dialog, so I can determine whether a document has really closed or not. 
But this brings in localization issues. Ideally I'd like a 'DocumentClosing' 
and 'DocumentSave' event.

date: Wed, 7 Mar 2007 01:36:00 -0800   author:   Alex Haan Alex