Event needed by the engine behind simple data binding so that it can work two way. In order to receive notifications for changes in the calculator value subscribe to the CalculatorValueChanged event.
Telerik.WinControls.UI (in Telerik.WinControls.UI.dll) Version: 2018.2.619.40 (2018.2.619.40)
public event EventHandler ValueChanged
Public Event ValueChanged As EventHandler