alloy:selectOneMenu

SelectOneMenu is a UISelectOne component that renders a select element (drop down list) and enables the user to select one value. Since it extends HtmlSelectOneMenu, it supports all the features of h:selectOneMenu such as accepting f:selectItem or f:selectItems as child tags.

Default Value Usage

A default value can specified using when the value attribute is bound via EL to a model bean property. 
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Source Code

Liferay Faces Alloy 4.1.1 + Liferay Faces Bridge Implementation 5.0.0 + Showcase Common 4.0.0 + Liferay Faces Util 3.4.1 + Mojarra 2.2.20