How can I add a new custom button only when user opens mail for read purpose?

I have created Outlook add-in using VS .Net 3.5.

In this Add-In I want to add a new custom button only when user opens mail for read purpose. It means when user tries to create New mail or performs any operations like Reply, Reply to all or Forward then I dont want to show this button.

I think I get this done if I check Inspectors EditorType property.

But in case of Outlook  2007 if we double click on any mail in inbox it opens new Inspector and its EditorType is olEditorWord which is same as Inspectors EditorType for New/Reply/ Reply to all/Forward

So how do I know distinguish mail is open for which purpose.  
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aplusexpertAsked:
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David LeeConnect With a Mentor Commented:
Hi, aplusexpert.

I don't see how checking the Inspector's EditorType property is going to be of any use.  EditorType tells us what editor (i.e. HTML, RTF, plain-text) Outlook is using.  If I open an HTML formatted message EditorType is going to be olEditorHTML without regard to whether I'm reading or editing.  Try this code snippet: http://www.outlookcode.com/codedetail.aspx?id=32

You'll need to modify the function declaration a bit.  Something like this

    Function ShowsComposeLayout(Item As Outlook.MailItem) As Boolean

Pass it an Inspector's CurrentItem and I think you'll be in business.
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