User menu: How do I define the liquidCrystal in my custom library? (1602)

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I have to admit, my skill to pose a question is worthless... :blush:
This code:

class myclass
{
 LiquidCrystal *lcd;
}

Is it supposed to be in the header of my Menu library, as a second class?

myclass:setLC(LiquidCrystal *_lcd) { lcd = _lcd; }

Should belong in the Menu.cpp file as a new constructor?

My current header:

#ifndef _Menu_h
#define _Menu_h

#include "Arduino.h"

class Menu
{
public:
	Menu();
	void all(String lB, String rB, String lO, String rO);
	void linksBoven(String s); //leftAbove on lcd
	void linksOnder(String s); //leftUnder on lcd
	void rechtsBoven(String s); //rightAbove on lcd
	void rechtsOnder(String s); //richtUnder on lcd
	void printMenu();
private:
	String _lO; //string	links onder/ 'right under'
	String _lB; //			links boven  'right above'
	String _rO; //			rechts onder	'right under'
	String _rB;//			rechts boven	'right above'
};
#endif

And current .cpp:

#include "Menu.h"
#include <LiquidCrystal.h>

LiquidCrystal lcd1(22, 23, 24, 25, 26, 27);

Menu::Menu(){
	Serial.println("Menu");

	lcd1.begin(16, 2);
}


#pragma region update text
void Menu::all(String lB, String rB, String lO, String rO){
	linksBoven(lB);
	rechtsBoven(rB);
	linksOnder(lO);
	rechtsOnder(rO);
	printMenu();
}

void Menu::linksBoven(String s){
	_lB = s;
}

void Menu::linksOnder(String s){
	_lO = s;
}

void Menu::rechtsBoven(String s){
	_rB = s;
}

void Menu::rechtsOnder(String s){
	_rO = s;
}

#pragma endregion

void Menu::printMenu(){
	lcd1.clear();
	lcd1.setCursor(0, 0);
	Serial.println(_lB.length());
	String s;
	if (_lB.length()>0)	lcd1.print(_lB);
	if (_rB.length() > 0)	{
		int pos = 16 - _rB.length() - 1;
		lcd1.setCursor(pos, 0);
		lcd1.print(" " + _rB);
	}
	if (_lO.length()>0)	lcd1.print(_lO);
	if (_rO.length() > 0)	{
		int pos = 16 - _rO.length()-1;
		lcd1.setCursor(pos, 1);
		lcd1.print(" " + _rO);
	}
}