virtual USB-Keyboard /w Keypad (Matrix)

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I would need help for my first arduino-project.

My aim ist to realise following:
I want to built a handheld for my WinXP-driven, cnc-mill. The controllsoftware do not have much shortcuts for important functions. My device should send sequences of keystrokes by bushing only one button. E.g. "alt + A + U". With my modifyed examplesketch (http://www.practicalarduino.com/projects/virtual-usb-keyboard) this works already fine. But I would need more buttons than the Arduino has digital inputs, so i thought I could use a keypad-matrix. When I tried to "merge" the virtual usbkeyboardsketch and the custum keypadsketch (delivered with the arduini IDE) the keypad will not work.

my testsketch has a small 2x2 matrix, the Test-keys are for testing the usb-part. With this sketch the buttons enter, red & blue work fine but my keypad does nothing.
Who could help an arduino-newbie, I can't see why it does not work.

#include <Keypad.h>
#include "UsbKeyboard.h"
// Test Keys
#define BUTTON_ENTER 8
#define BUTTON_RED 9
#define BUTTON_BLUE 10

// definition of the  matrix
const byte ROWS = 2; 
const byte COLS = 2; 
char hexaKeys[ROWS][COLS] = {
  {'A','B'},
  {'C','D'},
};
byte rowPins[ROWS] = {11, 12}; 
byte colPins[COLS] = {6, 7}; 

Keypad cusomKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

// LED für Extra Schalter
int ledPin = 3;


void setup()
{
  Serial.begin(9600);  
  // Initialisieren der LED
  pinMode (ledPin, OUTPUT);
  digitalWrite (ledPin, HIGH);

  pinMode (BUTTON_RED, INPUT);
  pinMode (BUTTON_BLUE, INPUT);
  pinMode (BUTTON_ENTER, INPUT);

  // aktiviert die internen PullUp
  digitalWrite (BUTTON_RED, HIGH);
  digitalWrite (BUTTON_BLUE, HIGH);
  digitalWrite (BUTTON_ENTER, HIGH); 

  // Disable timer0 since it can mess with the USB timing. Note that
  // this means some functions such as delay() will no longer work.
  TIMSK0&=!(1<<TOIE0);

  // Clear interrupts while performing time-critical operations
  cli();

  // Force re-enumeration so the host will detect us
  usbDeviceDisconnect();
  delayMs(250);
  usbDeviceConnect();

  // Set interrupts again
  sei();
}


/**
 * Main program loop. Scan for keypresses and send a matching keypress
 * event to the host
 * FIXME: currently repeats as fast as it can. Add transition detection
 */
void loop()
{
  
  // Einlesen der Matrix und serielle Ausgabe des Ergebnisses
  char customKey = cusomKeypad.getKey();
  
  if (customKey != NO_KEY){
    Serial.println(customKey);
  }
  // Einlesen der Extraschalter 
  UsbKeyboard.update();

  if (digitalRead(BUTTON_RED) == LOW) {
    delayMs(80);
    UsbKeyboard.sendKeyStroke(KEY_R);
    digitalWrite(ledPin, !digitalRead(ledPin)); // Toggle status LED
  }


   if (digitalRead(BUTTON_BLUE) == LOW) {
    UsbKeyboard.sendKeyStroke(KEY_H, MOD_SHIFT_LEFT);
    UsbKeyboard.sendKeyStroke(KEY_E);
    UsbKeyboard.sendKeyStroke(KEY_L);
    UsbKeyboard.sendKeyStroke(KEY_L);
    UsbKeyboard.sendKeyStroke(KEY_O);
    UsbKeyboard.sendKeyStroke(KEY_SPACE);
    UsbKeyboard.sendKeyStroke(KEY_W, MOD_SHIFT_LEFT);
    UsbKeyboard.sendKeyStroke(KEY_O);
    UsbKeyboard.sendKeyStroke(KEY_R);
    UsbKeyboard.sendKeyStroke(KEY_L);
    UsbKeyboard.sendKeyStroke(KEY_D);
    UsbKeyboard.sendKeyStroke(KEY_ENTER);
    digitalWrite(ledPin, !digitalRead(ledPin)); // Toggle status LED
  }

  if (digitalRead(BUTTON_ENTER) == LOW) {
    delayMs(80);
    UsbKeyboard.sendKeyStroke(KEY_E);
    digitalWrite(ledPin, !digitalRead(ledPin)); // Toggle status LED
  }
  
  
}


/**
 * Define our own delay function so that we don't have to rely on
 * operation of timer0, the interrupt used by the internal delay()
 */
void delayMs(unsigned int ms)
{
  for (int i = 0; i < ms; i++) {
    delayMicroseconds(1000);
  }
}