WinForm stuck at databound combobox !!

[Mami-0]

Hi, i have a very weird problem. Let me explain the situation; I define a datasource from an entity object and drag its fields to the form which generates a binding navigator and wincontrols associated with the entity object fields. When i interact with a combobox which is populated by an object that is the many side of the relation, i cant select another control, it just stucks at combobox. I cant select another combobox, textbox or any other thing. The only place i can interact is the datagrid which is bound to the entity object itself, where i change the selected item and then come back to the item again and edit other controls.

But i want to edit all porperties of the current item and then move to the next item.

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