By default, when an item is matched by the text entered in an editable RadComboBox, it will instantaneously be set as the SelectedItem of the control. The same result is observed when navigating through the items with the keyboard. Setting the UpdateSelectionOnLostFocus property to True overrides this behavior and the selection will only be updated when the focus is moved out of the control or the Enter key is pressed.
The property affects only an editable RadComboBox with single selection.
[XAML] Example 1: Set the UpdateSelectionOnLostFocus property
<telerik:RadComboBox IsEditable="True" UpdateSelectionOnLostFocus="True"> <telerik:RadComboBoxItem Content="Item 1" /> <telerik:RadComboBoxItem Content="Item 2" /> <telerik:RadComboBoxItem Content="Item 3" /> </telerik:RadComboBox>
You can have a look at the Configurator demo from the Silverlight Controls Samples to get a better understanding of how the UpdateSelectionOnLostFocus property works.