Question: I'm looking for a decent WPF or Winform time range selector, much like a home central heating system, where a time range is selectable.

<http://lhill.com.au/l%20hill%20web%20page%20pictures/time%20clock%202.jpg>

Is there any GUI libraries or examples available to fulfill this need?

Answer: 
You are mixing up variables, references and objects.

Doing `delete y;` removes the variable y. As the variable no longer exists, it will naturally no longer have a value. Thus the reference that the variable contained is gone.

Removing the variable will however not in itself remove the object that it was referencing. The array still contains a reference to the object, and neither of those depend on the existance of the variable.

There is actually no way of removing the object directly. You remove objects by destroying all references to it, not the other way around. You want the object to remove it's references, which is simply not how it works.
Would this help?

`Var x=[{}];
var y=x[0];`

Edit:
Sorry, I was a bit brief in my first attempt at answering. What I'd start asking is: why does y need to "exist" outside of the array in the first place? Can't you just create an array of objects and use delete or array.splice() to remove the object when you need to?

Second, if y needs to exist outside of the array, what you need to do is either to create a property that refers to the array index, or a utility function that can scan through the array to find the correct object reference to remove. In other words, something like 

```
var x=[]; var y={}; y.arrayIndex=(x.push(y)-1);

// later on, you want to get rid of y

delete x[y.arrayIndex]; delete y;

```