The Combo Box features enhanced support for the MVVM data pattern via the KnockoutJS library.
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Enable and configure the Combo Box load on demand, paging, and filtering functionality.
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jQuery Combo Box Combo Load on Demand  

You can easily set up "parent-child" relationships between any number of Combo Box controls on your page when you have relational or hierarchical data. This simplifies the amount of code you need to write to drop down the correct data in a child combo when a selection is made on the parent.
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jQuery Combo Box Cascading Drop Downs 

As the user types, the Combo's auto-suggest picks up the entered text and displays a list of suggested values.
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Auto-suggest displays suggested values for matching entered text. 
Enable multiple selection, with our without checkboxes. 

The Combo Box can be used as a single selection or a multi-select drop down list, using checkboxes via both keyboard and mouse.
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As the user enters value in the edit box, the Combo Box also highlights the text within the suggested list items.
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As text is entered, it is highlighted in the within the suggested list items. 
Customize every item in the drop down list by using templates. 

Customize every item in the drop down list by using templates.
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