Проблема с extentions стандартного контроллера

Всем привет.
Такая проблема - пытаюсь создать extentions стандартного контроллера, чтобы прикрутить кнопку к Contacts.
Создал класс апекса
[code]public with sharing class AddCommUserController {
	private final Account acct;
    private final Contact cont;
    private final User usr;
    public String ContactOwnerID;
    public String ManagerUserID;
    public String ManagerEMail;
    public String AccName;
    public String EmailBody;
    public String EmailSubject;

    public AddCommUserController(ApexPages.StandardController stdController) {
        this.cont = (Contact)stdController.getRecord();
        ContactOwnerID = cont.OwnerId;
        usr = [SELECT ManagerId FROM User WHERE Id = :ContactOwnerID];
        ManagerUserID = usr.ManagerId;
		usr = [SELECT Email FROM User WHERE Id = :ManagerUserID]; 
        ManagerEMail = usr.Email;
        acct = [SELECT Name FROM Account WHERE Id=:cont.AccountId];
        AccName = acct.Name;
        EmailSubject = 'Approval request for adding Customer Community User';
        EmailBody = 'Please approve new Customer Community User:'+'\n'+
                     'Account: '+AccName+'\n'+
                     'Contact: '+cont.FirstName+' '+cont.LastName;
    }
    
    public void sendMail(String address, String subject, String body) {
    // Create an email message object
		Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[] {address};
        mail.setToAddresses(toAddresses);
        mail.setSubject(subject);
        mail.setPlainTextBody(body);
        // Pass this email message to the built-in sendEmail method 
        // of the Messaging class
        Messaging.SendEmailResult[] results = Messaging.sendEmail(
                                 new Messaging.SingleEmailMessage[] { mail });
        inspectResults(results);
    }
    
    // Helper method
    private static Boolean inspectResults(Messaging.SendEmailResult[] results) {
        Boolean sendResult = true;
        
        // sendEmail returns an array of result objects.
        // Iterate through the list to inspect results. 
        // In this class, the methods send only one email, 
        // so we should have only one result.
        for (Messaging.SendEmailResult res : results) {
            if (res.isSuccess()) {
                System.debug('Email sent successfully');
            }
            else {
                sendResult = false;
                System.debug('The following errors occurred: ' + res.getErrors());                 
            }
        }
        
        return sendResult;
    }
}[/code]
Страница:
[code]<apex:page standardController="Contact" extensions="AddCommUserController">
  <apex:form >
        <apex:commandButton value="Add Community User" Action="{!sendMail}">
          <apex:param name="address" value="{!ManagerEMail}" />
          <apex:param name="subject" value="{!EmailSubject}" />
          <apex:param name="body" value="{!EmailBody}" />
        </apex:commandButton>
    </apex:form>      
</apex:page>[/code]
В итоге - ругается:
Unknown method 'ContactStandardController.sendMail()

Что я делаю не так?..