suppressCompleteMessage is a Method as of Q1 2015

[Telerik Admin]

As of Q1 2015, the suppressCompleteMessage property of the OnClientCheckFinished event's arguments is a method.

To prevent the informational alert, you now have to pass false as an argument (Example 1), instead of setting the property value, as in older versions (Example 2).

Example 1: Preventing the information alert in OnClientCheckFinished in Q1 2015 and later.

function OnClientCheckFinishedHandler(sender, args) {
    args.suppressCompleteMessage(true);//prevent the alert
    console.log('Spell check is complete');
}

Example 2: Preventing the information alert in OnClientCheckFinished
in versions before Q1 2015. 

function OnClientCheckFinishedHandler(sender, args) {
    args.suppressCompleteMessage = true;//prevent the alert
    console.log('Spell check is complete');
}