or
<Style TargetType="{x:Type TextBox}"> <Setter Property="t:StyleManager.Theme" Value="Office_Blue" /> <Style.Triggers> <Trigger Property="IsEnabled" Value="False"> <Setter Property="TextBox.Foreground" Value="Black" /> <!--does not work: --> <Setter Property="TextBox.Opacity" Value="1" /> </Trigger> </Style.Triggers></Style><telerik:RadTimeBar x:Name="xRadTimeBar" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="1" PeriodStart="1/1/2011 00:00:00" PeriodEnd="1/1/2011 00:00:10" VisiblePeriodStart="1/1/2011 00:00:00" VisiblePeriodEnd="1/1/2011 00:00:10" SelectionStart="1/1/2011 00:00:00" SelectionEnd="1/1/2011 00:00:10" IsSnapToIntervalEnabled="True" > <telerik:RadTimeBar.Intervals> <telerik:MinuteInterval IntervalSpans="1"/> <telerik:SecondInterval IntervalSpans="1"/> <telerik:MillisecondInterval IntervalSpans="4, 16, 32, 64"/> </telerik:RadTimeBar.Intervals> </telerik:RadTimeBar><telerik:RadTimeBar x:Name="xRadTimeBar" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="1" PeriodStart="1/1/2011 00:00:00" PeriodEnd="1/1/2011 00:00:01" VisiblePeriodStart="1/1/2011 00:00:00" VisiblePeriodEnd="1/1/2011 00:00:01" SelectionStart="1/1/2011 00:00:00" SelectionEnd="1/1/2011 00:00:01" IsSnapToIntervalEnabled="True" > <telerik:RadTimeBar.Intervals> <telerik:MinuteInterval IntervalSpans="1"/> <telerik:SecondInterval IntervalSpans="1"/> <telerik:MillisecondInterval IntervalSpans="4, 16, 32, 64"/> </telerik:RadTimeBar.Intervals> </telerik:RadTimeBar><telerik:GridViewDataColumn IsReadOnlyBinding="{Binding RegionIsDefined}"> <telerik:GridViewDataColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding Name}" /> </DataTemplate> </telerik:GridViewDataColumn.CellTemplate> <telerik:GridViewDataColumn.CellEditTemplate> <DataTemplate> <myRegionControl>... </myRegionControl> </DataTemplate> </telerik:GridViewDataColumn.CellEditTemplate></telerik:GridViewDataColumn>