This project started out after I found nothing in the Silverlight open source community that would allow me to use the popup control in a straightforward manner. It is now a fully fledged multilevel menu with support for templating, commanding and many other
goodies. I tried to make it as flexible as possible to answer the needs of most Silverlight developers out there while keeping it under 30K(zipped).

Click here to view a demo on the general capabilities of the control in handling shortcut, access keys(try Ctrl+Alt+M), left click, right click and
hover events.

In short here is what you get:

Nested Menus

Pinnable Menus

Boundary Detection

Animations

Keyboard Navigation

Shortcuts and Access Keys

Data Binding

Command Support

Vertical Menu Orientation

Context Menu

Styling

Use Existing Themes

Scrollable

Three State Checkbox

Item Template

Reusability

Just put an ItemsControl such as a ListBox inside it, specify the name(s) of the trigger control(s) and your menu is ready to fly when you left click, right click or hover the latter.

Any derivative a the ItemsControl like the Treeview can be used as template. However when no control is specified an auto-generated ListBox is used by default.
In the example below a menu consisting of a few menu items and a submenu will popup when the shortcut Ctrl+Alt+M is pressed or when Button1 is right or left clicked:

If you used the control and made improvements on it and would like to share it or if you got questions, comments, suggestions or critics then feel free to use my email address(hellozi at live dot com) for this purpose.