Here is a free open source menu for you to try:
http://sl4popupmenu.codeplex.com/[
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Its easy to use, provides quite advanced features and can fit in all kinds of scenarios.
Here's a list of some of its main features:
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