The drop down is closed because there is an additional framework logic that applies for the IsDefault property based on the different focus scopes
. In addition the drop down content of the split button is rendered in a Popup element which is placed in a different visual tree than the application. Currently, the Enter key executes the Click of the split part button of the RadSplitButton control because .
In order to achieve your requirement you can focus an element in the drop down content of the split button when it is opened. For example, the text input or the button itself.
sender, RoutedEventArgs e)
var content =
var button = content.FindChildByType<Button>();
I will also share the approach from your support ticket on the same topic, because it might be useful for someone that experiencing the same behavior.
sender, KeyEventArgs e)
(e.Key == Key.Return || e.Key == Key.Enter)
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