WPF: Restyle all controls with scroll bars

How can I change the st开发者_StackOverflow中文版yle -ONCE- for the scrollbars shown by all controls (listbox, treeview, scrollbarviewer, richtextbox, etc...)?

If you will define your Style for a control with no x:Key attribute, it will be applied for all instances of that control.

Try like this:

<Window.Resources>
    <Style TargetType="ScrollBar">
        <Setter Property="Background" Value="Red"/>
    </Style>
</Window.Resources>
<Grid>
    <TextBox Margin="24,12,0,0" VerticalScrollBarVisibility="Visible" AcceptsReturn="True" Height="28" VerticalAlignment="Top" HorizontalAlignment="Left" Width="89" />
    <ScrollBar Name="scroll" HorizontalAlignment="Right" />
</Grid>

Here you can see that the Style is defined for ScrollBar control and have no x:Key attribute defined so it gets applied to the each ScrollBar instance within Window. Like ScrollBar of TextBox and ScrollBar named scroll also.

Hope this helps!

Thanks. Finally the problem was solved by setting the style in the Themes/Generic.xaml and (because of custom controls existing in another assembly with they respective resources merged) adding the following to App.xaml...

<Application.Resources>
  <ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
      <ResourceDictionary Source="Themes/Generic.xaml"/>
      <ResourceDictionary Source="MyCtls/MyRes.xaml" />
    </ResourceDictionary>
</Application.Resources> 

The key point is to merge the Generic.xaml file. Also, if the resource dictionary is in another assembly, it must be referenced as...

<ResourceDictionary Source="pack://application:,,,/OtherAssembly;component/MyCtls/MyRes.xaml"/>