Issues with TFT LCD Touchscreen and Arduino mega

Thanks I think I am now having more success with the MCUFRIEND library
I am currently trying to make buttons that will allow selection of different menu screens (basically a main menu that will make it easier to select the correct function) I have been using the simple button example from the library as a template to build on but I am unsure as to how to make this select different screens and then allow the buttons on those new screens to function

//load required libraries
#include "Adafruit_GFX.h"
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft;
#include "TouchScreen.h"
#include <OneWire.h> 
#include <DallasTemperature.h>

//set touchscreen input pins


#define MINPRESSURE 10
#define MAXPRESSURE 1000

// ALL Touch panels and wiring is DIFFERENT
// copy-paste results from TouchScreen_Calibr_native.ino
const int XP = 6, XM = A2, YP = A1, YM = 7; //ID=0x9341
const int TS_LEFT = 75, TS_RT = 905, TS_TOP = 99, TS_BOT = 921;

TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

Adafruit_GFX_Button sensor, WC, WC_WC10, WC_WC20, WC_WC50, WC_Top, WC_Return; //list of buttons

int pixel_x, pixel_y;     //Touch_getXY() updates global vars
bool Touch_getXY(void)
{
    TSPoint p = ts.getPoint();
    pinMode(YP, OUTPUT);      //restore shared pins
    pinMode(XM, OUTPUT);
    digitalWrite(YP, HIGH);   //because TFT control pins
    digitalWrite(XM, HIGH);
    bool pressed = (p.z > MINPRESSURE && p.z < MAXPRESSURE);
    if (pressed) {
        pixel_x = map(p.x, TS_LEFT, TS_RT, 0, tft.width()); //.kbv makes sense to me
        pixel_y = map(p.y, TS_TOP, TS_BOT, 0, tft.height());
    }
    return pressed;
}
//Set up TFT colours
#define BLACK 0x0000
#define BLUE 0x001F
#define DARKBLUE 0x0010
#define VIOLET 0x8888
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
#define GOLD 0xFEA0
#define BROWN 0xA145
#define SILVER 0xC618
#define LIME 0x07E0


//Set temperature probe input
#define ONE_WIRE_BUS 22 
OneWire oneWire(ONE_WIRE_BUS); 
DallasTemperature sensors(&oneWire);

//Set varibles to run menu codes
int currentpage = 0; //0=homescreen, 1=waterchange menu, 2=temperature sensors.....

void setup()//////////////////
{
// initialising touch screen display
tft.reset();
tft.begin(tft.readID());
Serial.begin(9600);
Serial.println();
Serial.print("reading id....0x");
delay(500);
Serial.println(tft.readID(), HEX);

tft.fillScreen(BLACK); //fill screen with colour
tft.setRotation(0); //horizontal orientation
tft.setTextSize(3); //set size of font
tft.setTextColor(WHITE); //set colour of text

Serial.println("Dallas Temperature IC Control Library Demo");
 sensors.begin();
}
//Draw menu screen
void drawHome()
{
  tft.fillScreen(BLACK);
  tft.fillRect(40, 80, 160, 80, BLUE);// Menu header (start X, start Y, Length, Height
  tft.setTextSize(2);
  tft.setFont();
  tft.setTextColor(WHITE);
  tft.setCursor(70, 120);
  tft.print("  QA Manager");
  sensor.initButton(&tft,  60, 200, 100, 40, CYAN, CYAN, BLACK, "Temp", 2); // sensor menu
  WC.initButton(&tft, 180, 200, 100, 40, CYAN, CYAN, BLACK, "Manage", 2); //waterchange menu
  Adafruit_GFX_Button *buttons[] = {&sensor, &WC, NULL};
  bool update_button(Adafruit_GFX_Button *b, bool down)
{
    b->press(down && b->contains(pixel_x, pixel_y));
    if (b->justReleased())
        b->drawButton(false);
    if (b->justPressed())
        b->drawButton(true);
    return down;
}

/* most screens have different sets of buttons
 * life is easier if you process whole list in one go
 */
bool update_button_list(Adafruit_GFX_Button **pb)
{
    bool down = Touch_getXY();
    for (int i = 0 ; pb[i] != NULL; i++) {
        update_button(pb[i], down);
    }
    return down;
}
}

void drawWC()
{
 tft.fillScreen(BLACK);
 tft.fillRect(25, 30, 190, 80, BLUE, WHITE, "Water Changes", 2);// Menu header (start X, start Y, Length, Height
  tft.setTextSize(2);
  tft.setFont();
  tft.setTextColor(WHITE);
  tft.setCursor(50, 55);
  tft.print("Water Changes");
  WC_WC10.initButton(&tft,  60, 140, 100, 40, CYAN, CYAN, BLACK, "WC 10%", 2);
  WC_WC20.initButton(&tft,  60, 190, 100, 40, CYAN, CYAN, BLACK, "WC 20%", 2);
  WC_WC50.initButton(&tft,  60, 240, 100, 40, CYAN, CYAN, BLACK, "WC 50%", 2);
  WC_Top.initButton(&tft,  180, 140, 100, 40, CYAN, CYAN, BLACK, "Top Up", 2);
  WC_Return.initButton(&tft,  180, 240, 100, 40, RED, Red, BLACK, "Back", 2);
  Adafruit_GFX_Button *buttons[] = {&WC_WC10, &WC_WC20, &WC_WC50, &WC_Top, &WC_Return, NULL};
  delay(300);
  bool update_button(Adafruit_GFX_Button *b, bool down)
{
    b->press(down && b->contains(pixel_x, pixel_y));
    if (b->justReleased())
        b->drawButton(false);
    if (b->justPressed())
        b->drawButton(true);
    return down;
}
}
void loop(void)

    }
    if (WC.justPressed()) {
        currentpage==1;
         drawWC(); //open waterchange menu
    }
}
}

}

Does anyone have any advice