You can build custom popup menus that will respond to right click events:
http://www.vb123.com/Toolshed/05_map/ch07_rightclickmenu.htmAs to customizing - you work with shortcut menus the same as any other menu. Here's a good site for starters:
http://jamiessoftware.tk/articles/menubars.htmlYou would NOT do this in the Current event of the form, but instead in whatever event you use to invoke the menu ... so if you add code to the Click event of whatever control/section you want to show the menu.
The code below shows one method for doing this. In order to use this code, you'd need a reference to the Microsoft Office xx Library (where xx is the version you're working with). Obviously this is specific to an applicaiton of mine, but hopefully it will show you how to work with those things.