After moving a tile around, the opacity setting seems to be reset to 1.0. Please see this simple example. Did I miss something obvious?
<Window x:Class="TileTest.MainWindow" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" Title="MainWindow" Height="350" Width="525" Background="Orange"> <Grid> <telerik:RadTileView RowsCount="2" Margin="40"> <telerik:RadTileViewItem Header="Item1" Background="Black" Opacity="0.2"> <TextBlock Text="Item2 Content"/> </telerik:RadTileViewItem> <telerik:RadTileViewItem Header="Item2" Background="Black" Opacity="0.3"> <TextBlock Text="Item2 Content"/> </telerik:RadTileViewItem> <telerik:RadTileViewItem Header="Item3" Background="Black" Opacity="0.4"> <TextBlock Text="Item3 Content"/> </telerik:RadTileViewItem> <telerik:RadTileViewItem Header="Item4" Background="Black" Opacity="0.5"> <TextBlock Text="Item3 Content"/> </telerik:RadTileViewItem> <telerik:RadTileViewItem Header="Item5" Background="Black" Opacity="0.6"> <TextBlock Text="Item3 Content"/> </telerik:RadTileViewItem> <telerik:RadTileViewItem Header="Item6" Background="Black" Opacity="0.7"> <TextBlock Text="Item3 Content"/> </telerik:RadTileViewItem> <telerik:RadTileViewItem Header="Item7" Background="Black" Opacity="1"> <TextBlock Text="Item3 Content"/> </telerik:RadTileViewItem> </telerik:RadTileView> </Grid></Window>