Templates – You can easily change the default ItemTemplate and SelectedItemTemplate. When the list (positioned inside the drop down part) is scrolled, the ComboBox reuses the existing items to display the relevant data instead of creating new ones. UI Virtualization Support - ComboBox supports UI Virtualization which enables you to display large list of items. For this purpose, you will need to define the HeaderTemplate property and the FooterTemplate property. Header and Footer – ComBoBox for Xamarin gives you the ability to add header and footer inside the dropdown list. The watermark text is displayed when the input field is empty, or the selected item/s is/are cleared. 
Placeholder – The text which is used to give guidance to the end user on what should be entered/searched in the input.Search Highlighting Text – ComboBox control highlights the matching text inside the dropdown list based on the given input after searching is performed.Check here for more details how Data Binding works. Complex Object Support – ComboBox control provides you a way to specify which property of your complex business object to be displayed in the control by setting DisplayMemberPath.To learn more about the Selection please check the Single and Multiple Selection topic. You can easily specify the required selection using the SelectionMode property.
Single and Multiple Selection Support – ComboBox control has a support for single and multiple selection. View the Searching article for more details. The available options are: Contains, StartsWith, ContainsCaseSensitive and StartsWithCaseSensitive. Searching Support – ComboBox provides both case-sensitive and case-insensitive searching modes. For more details please check the Editing article. When the control is in edit mode searching can be performed. 
Editable and NonEditable mode – ComboBox supports both editable and noneditable state. Download Free Trial Figure 1: ComboBox for Xamarin Overview
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