Generally working with the UI elements (as searching in the Visual Tree) is definitely not a recommended approach as it may lead to future problems. It is better to work with the data elements.
May you please specify what combo box do you mean? If you do mean your custom combo, used for selecting the appropriate data, then you may directly access it. Having a reference to your control allows you to find the info that you need from the selected value.
the Telerik team
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