We are not aware of such issue in that current version of RadComboBox. The control hasn't been tested with the mentioned Barco application and there could be issues with that integration. You could set the AllowsTransparency
directly to the Popup
of the RadComboBox by adding a Style with TargetType="Popup"
and set the property to the desired value. The next code snippet shows how to declare the described style in the App.xaml of your project:
Hope this is helpful.
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