Menu button contains a button and a menu component, when click or move mouse over the button, a corresponding menu will show.
To define a menu button you should define a link button and a menu, below is an example:
<div style="background:#fafafa;padding:5px;width:200px;border:1px solid #ccc">
<a href="#" class="easyui-menubutton" menu="#mm1" iconCls="icon-edit">Edit</a>
<a href="#" class="easyui-menubutton" menu="#mm2" iconCls="icon-help">Help</a>
</div>
<div id="mm1" style="width:150px;">
<div iconCls="icon-undo">Undo</div>
<div iconCls="icon-redo">Redo</div>
<div class="menu-sep"></div>
<div>Cut</div>
<div>Copy</div>
<div>Paste</div>
<div class="menu-sep"></div>
<div iconCls="icon-remove">Delete</div>
<div>Select All</div>
</div>
<div id="mm2" style="width:100px;">
<div>Help</div>
<div>Update</div>
<div>About</div>
</div>