The newly introduced functionality of the Toggle Handle is specially designed to improve the usability and provide a unified behavior of the RadMenu
when used either on a traditional desktop or on a touch device.
You can use this functionality by setting the ShowToggleHandle property of the control to true (this property is set to false by default).
Once you set this property, an arrow called Toggle Handle will appear next to the item's text.
By clicking or touching it (depending on the device that you use) you can show or hide the sub items of the corresponding item of the RadMenu. Thus, you can freely expand or collapse
items without executing any other action like navigation or a server-side event execution for instance.