When we have debuged the issue we have found out that this is a framework change and the event is handled in Silverlight 5. In order to handle TextInput, you need to use AddHandler method and listen for the handled events too. For example:
this.combo.AddHandler(Control.TextInputEvent, new TextCompositionEventHandler(this.RadComboBox_TextInput), true);
Also, please note that you can use the filtering functionality without the DisplayMemberPath being set. So in order the filtering to know according to witch property to search and filter you need to set the
TextSearch.TextPath attached property to the RadComboBox :
<telerik:RadComboBox telerik:TextSearch.TextPath="Name" ...
Hope this would help.
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