Hi Andrew,
In order to achieve that you will have to edit the template of the ComboBox. Just drop a ComboBox control in the design surface of Expression Blend, right-click it and choose from the menu
Edit Template -> Edit a Copy. Then, Blend will generate all the needed resources and templates for the ComboBox. Find the ContentControl with
x:Name="DropDownIcon" and
Template="{StaticResource ArrowTemplateEditableCombobox}". This is the control which represents the dropDown button in editable mode. You can remove it and use only the TextBox of the ComboBox.
Hope this information helps. Please let us know if you have further questions.
Kind regards,
Konstantina
the Telerik team
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