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The beforeRender event occurs after data has been selected from the database but before its outputting to client.

class CustomBehavior extends ConnectorBehavior{
    public void beforeRender(DataItem data) {
         //any custom code
component.event.attach(new CustomBehavior());

In this event beforeRender method gets data item object as incoming argument. This object has methods to set properties of data, it can be used to format data in custom way before outputting to client side.

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