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You can easily edit the style of the ComboBox in Expression Blend. Just drop a ComboBox control in the design surface, right-click it and choose from the menu Edit Template->Edit a Copy
. Then, Blend will generate for you all the styles and templates of the ComboBox. Find the style with x:Key="ArrowTemplateNonEditableCombobox"
if you use the ComboBox in non editable mode or ArrowTemplateEditableCombobox
if the ComboBox is editable.
Hope this helps. If you require further help please let us know.
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