How to make GUI pop up when you touch other gui

Hello, i want to make some c# script that causes some GUI to appear, i already have the script in place that will recognise the touch, i just need the couple of lines of code that can make a GUI pop up to appear.

Hey,
How I do it is by using booleans.

public class Display : MonoBehaviour
{

 public bool guiUP;//false by default

void OnGUI()
{
   if (GUI.Button(new Rect(0,0,100,50),"Toggle GUI"))
   {
    guiUP = true;
    //OR guiUP = !guiUP for a real toggle//
   }


  if(guiUP)
  {
  ///Display your stuff
  }
}

}