Create custom verbs for SharePoint 2010 web parts

Reference:

http://msmvps.com/blogs/sundar_narasiman/archive/2012/07/08/create-custom-verbs-for-sharepoint-2010-web-parts.aspx

http://sharepointlessons.blogspot.sg/2009/04/creating-webpart-verbs.html

If you want to show added verbs when page in display mode use below code

WebPartManager wpmgr = WebPartManager.GetCurrentWebPartManager(Page);

if (wpmgr.DisplayMode == WebPartManager.BrowseDisplayMode)

 {

// write code here to add verb menu.

 }