EasyMenu is used as a ContextMenu, attached to an input button.

Menu will be displayed at the mouse position.
Right-click on the button and the menu will be displayed.
Left-click on the button and the menu will be displayed also, this time using the client side method showMenu.

<oem:EasyMenu id="EasyMenu1" runat="server" AttachTo="button1" ...                         <input type="button" id="button1" value="Show Menu"                              onclick="ob_em_EasyMenu1.showMenu(event, this)" />

Menu can also be displayed at a specified absolute position.
Left-click the button.

<oem:EasyMenu id="EasyMenu2" runat="server" AttachTo="button1" ...                         <input type="button" id="button2" value="Show Menu"                          onclick="ob_em_EasyMenu1.showMenu(event, this, 500, 400)" />