# Stack Support

This example shows how you can work with the `zIndex` attribute which the Overlay supports, to implement a simple `bringToTop` function. The example code also listens for changes in the `zIndex` attribute, which it uses to update the content of the overlay, when it is brought to the top of the stack.

Click on an Overlay, to switch it's zIndex with the highest zIndex in the stack, bringing it to the top of the stack:

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