Thank you for the screenshot. Now I see what you mean. However this is not possible.
This is how RadFilter works: When you choose to Add Expression, as selected field comes the first data field from the FieldEditors collection of RadFilter. This collection is built two ways: automatically, if RadFilter is connected to a control; manually, if you have the FieldEditors declaratively defined.
So the only way o display --select-- values as the default selected one, you should have a FieldEditor which DisplayName is set to --select--. But for the RadFilter to work properly, you should still have a valid FieldName bound to this field editor.
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