[Logical Error] Select a game object and perform actions using GUI.Button

Questions & Answers
1

I am currently working on a strategy game and I want to preform actions using GUI.Button on game objects.
I am using ray cast and mouse click to select the object however when I click on GUI.Button to take out
another action the button disappears. I want to use that button to open up another GUI.Box to show some descriptions.

I know why the button is disappearing, it is because I am projecting the ray cast to my button clicks in the update function but how
can I avoid this? should I use another way of selecting objects instead of ray cast or else?

Here is my script:

#pragma strict
@HideInInspector
var isCalled:int = 0;
@HideInInspector
var scWidth:int = 0;
@HideInInspector
var scHeight:int = 0;
function Start () {
	scWidth = Screen.width;
	scHeight = Screen.height;		
}

function Update () {
if (Input.GetMouseButtonDown(0)) {
         var ray : Ray = Camera.main.ScreenPointToRay (Input.mousePosition);
         var hit : RaycastHit;
         if (Physics.Raycast (ray, hit)) {
             if (hit.collider.tag == "House") {
             isCalled = 1;
            } else{
             isCalled = 0;
             }
          }
     }
}

function OnGUI(){
if(isCalled==1)
GUI.Button(Rect(scWidth/2,(scHeight/2)+(scHeight/4),120,120), name);
}
2

EventTrigger

https://unity3d.com/learn/tutorials/modules/beginner/ui/ui-events-and-event-triggers