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Error occures only with Silverlight 5 beta runtime installed. Remove this post, pleaseWhen setting RadTabItem content, there is a runtime (event sometimes design-time) exception:
Set property 'System.Windows.Controls.ContentControl.Content' threw an exception.
<UserControl x:Class="RadTabControlTestProject.MainPage" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <telerik:RadTabControl> <telerik:RadTabItem> <!--<Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <TextBlock Text="Sample text:" /> </Grid>--> <TextBlock Text="Sample Text" /> </telerik:RadTabItem> </telerik:RadTabControl> </Grid></UserControl>
Exception occures even on Your demos website ;) http://demos.telerik.com/silverlight/#TabControl/FirstLook