The event handler method receives the following arguments:
sender
A Picker instance, which is the source of the event. This object will be passed to the handler function as the first argument.
args
A ValueChangedEventArgs instance, which contains event data. This object will be passed to the handler function as the second argument.

The following code handles the stateChanged event of a DateTimePicker:

JavaScript  Copy Code
// Handle the stateChanged event. dateTimePicker.stateChanged.addEventListener(handleStateChanged); // This is the handler function of the stateChanged event function handleDropDownShow(sender, args) {   if(sender.state === u.ValidationState.Valid)     {       //do something     } }

Picker Members
Picker Class
MindFusion.Common.UI Namespace