Toolbar's show() and hide() method do not properly toggle items visibility in the overflow popup.

Case 1: https://dojo.telerik.com/aXEyIrEW/6

The 'Button' is visible in both the Toolbar and the overflow popup initially.

Case 2: https://dojo.telerik.com/erEnafir/39

When the Toolbar is resized so that the 'Dashboard' button is not visible, the 'Dashboard' button is also not visible in the overflow popup.