Remove the "IsEditable=True" from your combobox. That's the problem. Most combobox are non-editable, at least in our tool (which is why the default is false, not sure why you thought to set that property to true). I guess I confused you by using the word "edit", but I was trying to indicate the top textbox part as opposed to the bottom drop-down part. Anyway, black text in combobox also shows up in your RadGridView column header filter dropdown window, where those combobox are non-editable, for another example.
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