Modeless forms in add-inshttp://msmvps.com/blogs/carlosq/archive/2008/11/17/modeless-forms-in-add-ins.aspxBasically you could use three kind of forms in your add-ins: - Modal forms: these are regular forms that are shown modally and block the UI until you dismiss them. For example, the Options window of Visual Studio. - Modeless forms: there are regular formsenCommunityServer 2008.5 SP2 (Build: 40407.4157)