Triggers.xaml

    <Grid>
        <StackPanel>
            <Button Margin="10" Width="100" Height="30" Content="Click Me" x:Name="btn"/>
            <TextBlock Margin="10" Text="Hello, styled world!" FontSize="28" HorizontalAlignment="Center" VerticalAlignment="Center">
                <TextBlock.Style>
                    <Style TargetType="TextBlock">
                        <Setter Property="Foreground" Value="Blue"></Setter>
                        <Style.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Foreground" Value="Red" />
                                <Setter Property="TextDecorations" Value="Underline" />
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </TextBlock.Style>

            </TextBlock>
            <CheckBox Margin="10" Name="cbSample" Content="Hello, world?" />

            <TextBlock Margin="10" HorizontalAlignment="Center"  FontSize="48">
                <TextBlock.Style>
                    <Style TargetType="TextBlock">
                        <Setter Property="Text" Value="No" />
                        <Setter Property="Foreground" Value="Red" />
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding ElementName=cbSample, Path=IsChecked}" Value="True">
                                <Setter Property="Text" Value="Yes!" />
                                <Setter Property="Foreground" Value="Green" />
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </TextBlock.Style>
            </TextBlock>
        </StackPanel>
    </Grid>