Hi Big,
The first link display an error: "The file you are trying to access is temporarily unavailable. Please try again later."
Hopefuly the App xaml works.
I have removed the ValidationTooltip presenter from the RadComboBox. And added a small red x visual on the proper place. There are Visual States that could be used to show and hide that mark later. For more information please check the attached project.
Regards,
Pana
the Telerik team
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