Issues with TFT LCD Touchscreen and Arduino mega

[idunnoino]

@lochender

bool update_button(Adafruit_GFX_Button *b, bool down)
{
    b->press(down && b->contains(pixel_x, pixel_y));

Do this contains() check before calling update_button() will make it more effective.

And try this:
Struct menuitems
{
Adafruit_GFX_Button menuitem ;