The only way to detect when a control has completed binding to a datasource is via it's dataBound event. When you need to know if multiple controls have been dataBound it creates a less than ideal situation.

A common scenario I encounter is when I have a search view with multiple dropdownlists and I need to set default values in those dropdownlists prior to loading a Kendo grid with search results based on the selections in the dropdownlists. Note: these are not cascading dropdowns - each dropdownlist is independent of the others. 

In order to set the selected values in each dropdownlist I have to know when each one is databound and only then can I set the selected value. Once all dropdownlists are databound then I can refresh the grid based on those selections. 

In order to make this work I have to "chain" the dropdownlists together. To do this I set the first dropdownlist AutoBind = true and the rest false. When the first dropdownlist dataBound event fires my JavaScript selects the correct value in that dropdownlist and refreshes the datasource on the next dropdownlist in the chain. When its dataBound event fires I select its value and refresh the next dropdownlist's datasource in the chain and so forth. This pattern continues until all dropdownlists are databound. In the last dropdownlist dataBound event handler I refresh the grid's datasource now that all the default selections have been made. 

This implementation is messy and cumbersome. It would be nice to have a parent Kendo ajax manager that all databound controls in the view could register with when the view loads. Then each databound control would notify the ajax manager when it is databound. The ajax manager would then fire an event to indicate that all controls have been databound. Then my code could handle setting the default dropdownlist values and refreshing the grid in one event handler which would be much cleaner than the current approach.