Hi , actually it is long term issue, it is here few Telerik versions already, this time it appeared again. Issue is - some telerik controls are working thru http://schemas.telerik.com/2022/xaml/maui namespace but some are not. Have to use clr-namespace:Telerik.Maui.Controls;assembly=Telerik.Maui.Controls . Very annoying. Today after upgrade i have to go thru all source files (xaml) and change it again. Below is example of issue, assume i have 20+ xaml files there... Yes, i did clean, rebuild etc.