Create Styles That Adapt to the Current OS Theme
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPF" Height="134" Width="200"> <Window.Resources> <SolidColorBrush x:Key="ButtonText" Color="Black"/> <Style x:Key="CustomProgressBarStyle" TargetType="{x:Type ProgressBar}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ProgressBar}"> <Grid MinHeight="20" MinWidth="240"> <Border Name="PART_Track" Background="{DynamicResource {x:Static SystemColors.InactiveCaptionBrushKey}}" BorderBrush="{DynamicResource {x:Static SystemColors.InactiveBorderBrushKey}}" BorderThickness="1" /> <Border Name="PART_Indicator" Background="{DynamicResource {x:Static SystemColors.ActiveCaptionBrushKey}}" BorderBrush="{DynamicResource {x:Static SystemColors.ActiveBorderBrushKey}}" BorderThickness="1" HorizontalAlignment="Left" /> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </Window.Resources> <StackPanel> <ProgressBar Value="30" HorizontalAlignment="Center" Margin="4" Style="{DynamicResource CustomProgressBarStyle}"/> <Button Margin="4" Content="Custom Brush" Foreground="{DynamicResource ButtonText}"/> <Button Margin="4" Content="System Brush" Foreground="{DynamicResource {x:Static SystemColors.ActiveCaptionBrushKey}}"/> </StackPanel> </Window>