Thank you for the provided image.
The underscores in a CheckBox control are used for key access. More information about this can be found in the following article: Missing Underscore with Label or CheckBox.
What I can suggest to correctly display it would be to iterate over all checkboxes in the loaded event of the RadPivotFieldList and escape the underscore, like so:
private void radPivotFieldList_Loaded(object sender, RoutedEventArgs e)
var list = sender as RadPivotFieldList;
var checkBoxes = list.ChildrenOfType<CheckBox>();
foreach (var checkBox in checkBoxes)
checkBox.Content = checkBox.Content.ToString().Replace("_", "__");
Please let me know whether such an approach would work for you.
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