int to string, weird string value?

MainScript.js

 var CorrectOrder: String;
 var ClickedOrder: String;
 
 function ClickedTube(ID: int)
 {
     ClickedOrder = ClickedOrder + ID.ToString;
     print(ID.ToString);
 }

OtherScript.js

 var myID: int;
 var MainObject: MainScript;
 
 function Awake()
 {
     MainObject = transform.parent.GetComponent(MainScript);
 }
 function OnMouseDown() 
 {
 
     MainObject.ClickedTube(myID);
 }

What I'm trying here is basically letting the player click on a couple of "items", which then should send an ID number to the main script. the ClickedTube function adds it to a string.

However it seems like it does not send the actual number, or the conversion to string is wrong, as it gives me the following instead of an int value:

 CompilerGenerated.__MainScript_ClickedTube$callable0$10_42__

and prints the following:

 CompilerGenerated.__MainScript_ClickedTube$callable0$10_42__
 UnityEngine.MonoBehaviour:print(Object)
 MainScript:ClickedTube(Int32) (at Assets/Standard Assets/Scripts/PanFluteStatue/MainScript.js:11)
 FluteScript:OnMouseDown() (at Assets/Standard Assets/Scripts/PanFluteStatue/FluteScript.js:10)
 UnityEngine.SendMouseEvents:DoSendMouseEvents()

I wonder, what am I doing wrong?o.o

Thanks in advance!