Check for open Outlook dialog box

Question

When using VBA or .Net with OOM (f.ex. Microsoft.Office.Interop.Outlook.MailItem) to display a new mailitem, everthing works like expected.

But when a modal dialog box is open inside Outlook (f.ex. manage rules), the display-method fails with "Outlook can't do this, because a dialog box is open. Please close it and try again".

Does anyone know a way check Outlook for open dialog boxes? There is no property "CanDisplayMailItem"...

Other ideas?

Patrick