The follow code doesn't work:
<telerik:RadComboBox Name="testcc" ItemsSource="{Binding TestTypes}" SelectedItem="{Binding SelectedTestType}" IsEditable="True" StaysOpenOnEdit="True" IsFilteringEnabled="True" TextSearchMode="Contains" DisplayMemberPath="FullName"/>I tried setting OpenDropDownOnFocus="True", and it works only for the first time. When the ComboBox is still on focus but the dropdown is close, I tried typing in the textbox the dropdown will not open.