Initialize an "instance of the Class" inside a Class

I'm trying to Initialize an instance of a new Class (object) inside a Class Function (Setup) and have the new Object available to the other Functions, having problem with sharing (scope) the new objects between Functions..

/* 
* Class_LCD_Display.cpp
*
* Created: 9/13/2014 8:46:49 AM
* Author: Byron
*/

#include <Arduino.h>
#include <ReadTimeData.h>
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#include "Class_LCD_Display.h"



// This works but the address is hard coded inside this Class
//-->   LiquidCrystal_I2C lcd(0x26,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

//Constructor
Class_LCD_Display::Class_LCD_Display()
{
}//Class_LCD_Display

//Destructor
Class_LCD_Display::~Class_LCD_Display()
{
}//~Class_LCD_Display

//Public--------------------

void Class_LCD_Display::LCD_Setup(int I2C_ADDR){

         // This works only for this function/member, how do I share this "instance of the Class" to the other funtions?
	//--> LiquidCrystal_I2C lcd( I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
	
	//Initialize the lcd
	lcd.begin (20,4);

	//Switch on the backlight
	lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
	lcd.setBacklight(LED_ON);

	//Clear the display
	LCD_Clr();

	//Backlight ON if under program control
	lcd.backlight();

}//End LCD_Setup


// Called from .ino
void Class_LCD_Display::LCD_Clr(){
	//Clear the display
	lcd.clear();
	delay(1000);
	lcd.home();
}//End LCD_Clr

//Called form .ino
void Class_LCD_Display::LCD_Display(int X_Pos, int X_Row, String LCD_string){
	String Blk_ln = "                    ";
	//
	lcd.setCursor(X_Pos,X_Row);
	lcd.print(Blk_ln);
	lcd.setCursor(X_Pos,X_Row);
	lcd.print(LCD_string);
	
}//End LCD_Display

I'm trying to Initialize an instance of a new Class (object) inside a Class Function (Setup) and have the new Object available to the other Functions, having problem with sharing (scope) the new objects between Functions..

using the Names of The Classes that you are Having problems With is Usually a Good idea.

Using proper capitalization is always a good idea.

Which class are you trying to create an instance of? In which function?

If it's an instance of LiquidCrystal, you need to construct it at the same time you construct the Class_LCD_Display instance.

Notice that NONE of the Arduino classes uses Class in the name. Ditch it from your class, too.

LCD_Display::LCD_Display(), lcd(/* the needed arguments */)
{
}

You have to declare lcd as an instance of LiquidCrystal in the private section of your class definition.

YourComments

Using proper capitalization is always a good idea.

Not sure what you are saying other then style, can you point me to some example so I can better understand?

Notice that NONE of the Arduino classes uses Class in the name. Ditch it from your class, too.

OK

Which class are you trying to create an instance of? In which function?

void Class_LCD_Display::LCD_Setup(int I2C_ADDR){
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

If it's an instance of LiquidCrystal, you need to construct it at the same time you construct the Class_LCD_Display instance.