hi
I was using RadWindow as my main window.
it was correctly in the 2019 version but after updating to the new version the preview stopped showing.
What should I do to solve the problem?
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i found my answer in https://docs.telerik.com/devtools/wpf/controls/radwindow/how-to/use-radwindow-as-user-control
i must add
Style="{StaticResource RadWindowStyle}" to radwindow prperty