mp:selectOne not rendering

[renatofritola]

The component is not being rendered. I used other components like button, input, text area and these work correctly. Below is part of my code:

                        <form id="formCadImovel">
				<div class="ui-g">
					<div class="ui-g-6">
						<div class="ui-g-12">
							<p:outputLabel>Descrição</p:outputLabel>
						</div>

						<div class="ui-g-12">
							<p:inputText id="descricao"></p:inputText>
						</div>
					
						<div class="ui-g-12">
							<p:outputLabel>Descrição</p:outputLabel>
						</div>

						<div class="ui-g-12">
							<mp:selectOne value="#{selectOneBean.valueFixed}">
								<f:selectItem itemLabel="Option 1" itemValue="1" />
								<f:selectItem itemLabel="Option 2" itemValue="2" />
								<p:ajax update="firstRow" process="@this" />
							</mp:selectOne>
						</div>
					</div>
				</div>
				
			</form>