When a ListBox is "below" a RadBusyIndicator in the visual tree, it seems to have a focus
or styling issue; its color changes to a light gray or off-white. Is this a known issue or
expected behavior? Is there a work-around? Here is a sample UserControl I threw together
to demonstrate what it's doing. The first ListBox appears correctly, the second one is shaded.
<UserControl x:Class="ListBoxFocusIssueUC"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:tk="http://schemas.telerik.com/2008/xaml/presentation"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ListBox Grid.Row="0" BorderThickness="0" MaxHeight="80">
<ListBox.Items>
<ListBoxItem Content="Item #1" />
<ListBoxItem Content="Item #2" />
<ListBoxItem Content="Item #3" />
</ListBox.Items>
</ListBox>
<tk:RadBusyIndicator Grid.Row="1" Background="Transparent" BusyContent="Testing..." IsBusy="true">
<ListBox BorderThickness="0" MaxHeight="80">
<ListBox.Items>
<ListBoxItem Content="Item #1" />
<ListBoxItem Content="Item #2" />
<ListBoxItem Content="Item #3" />
</ListBox.Items>
</ListBox>
</tk:RadBusyIndicator>
</Grid>
</UserControl>