'Primefaces keydown, keyup Event on SelectoneMenu not working

i need to get the Key Value from a Primefaces Selectonemenu after Tab or Shift Tab is beeing pressed. Unfortunately the onkeydown, onkeyup attributes from this element does not work. Is that a bug and if so, is there a workaround for this? Thank u very much in advance.

In this example im just trying to see if an alert box is beeing called:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:p="http://primefaces.org/ui"
    xmlns:f="http://xmlns.jcp.org/jsf/core">

<h:head>
    <title>PrimeFaces check SelectoneMenu</title>
    <h:outputStylesheet library="webjars"
        name="primeflex/2.0.0/primeflex.min.css" />
    <style type="text/css">
</style>
</h:head>
<h:body>
    <h:form>
        <p:selectOneMenu id="option" onkeydown="alert('key down pressed')"
            value="#{selectOneMenuView.selectedOption}" filter="true" filterMatchMode="contains">
            <f:selectItem itemLabel="Select One" itemValue="" />
            <f:selectItem itemLabel="Option1" itemValue="Option1" />
            <f:selectItem itemLabel="Option2" itemValue="Option2" />
            <f:selectItem itemLabel="Option3" itemValue="Option3" />
            <f:facet name="footer">
                <p:divider styleClass="p-mt-0" />
                <h:outputText value="3 options" style="font-weight:bold;" />
            </f:facet>
        </p:selectOneMenu>
    </h:form>
</h:body>
</html>

Here is my pom:

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>CheckPrimefaces</groupId>
    <artifactId>CheckPrimefaces</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>

        <servlet.version>3.1.0</servlet.version>
        <jsf.version>2.2.15</jsf.version>
        <primefaces.version>6.1</primefaces.version>

        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
        <tomcat7-maven-plugin.version>2.2</tomcat7-maven-plugin.version>
    </properties>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.3</version>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.webjars.npm</groupId>
            <artifactId>primeflex</artifactId>
            <version>2.0.0</version>
        </dependency>
        <!-- Servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${servlet.version}</version>
            <scope>provided</scope>
        </dependency>
        <!-- JSF -->
        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>${jsf.version}</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>${jsf.version}</version>
            <scope>compile</scope>
        </dependency>
        <!-- PrimeFaces -->
        <dependency>
            <groupId>org.primefaces</groupId>
            <artifactId>primefaces</artifactId>
            <version>11.0.0</version>
        </dependency>
    </dependencies>
</project>

This Programm is run on Eclipse in a tomcat v7 Live Server.

jsf primefaces

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'Primefaces keydown, keyup Event on SelectoneMenu not working

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