How to connect Themes/Generic.xaml to window1.xaml?

Question

I have the following button style in Themes/Generic.xaml and I want it to apply to buttons everywhere in my WPF application.

How do I connect it to my window1.xaml for instance?

<Style TargetType="{x:Type Button}">
  <Setter Property="SnapsToDevicePixels" Value="true"/>
  <Setter Property="OverridesDefaultStyle" Value="true"/>
  <Setter Property="MinHeight" Value="23"/>
  <Setter Property="MinWidth" Value="75"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Button}">
        <Border 
          x:Name="Border"  
          CornerRadius="2" 
          BorderThickness="1"
          Background="#C0C0C0"
          BorderBrush="#404040">
          <ContentPresenter 
            Margin="2"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            RecognizesAccessKey="True"/>
        </Border>
        <ControlTemplate.Triggers>
          <Trigger Property="IsKeyboardFocused" Value="true">
            <Setter TargetName="Border" Property="BorderBrush" Value="#202020" />
          </Trigger>
          <Trigger Property="IsDefaulted" Value="true">
            <Setter TargetName="Border" Property="BorderBrush" Value="#202020" />
          </Trigger>
          <Trigger Property="IsMouseOver" Value="true">
            <Setter TargetName="Border" Property="Background" Value="#808080" />
          </Trigger>
          <Trigger Property="IsPressed" Value="true">
            <Setter TargetName="Border" Property="Background" Value="#E0E0E0" />
            <Setter TargetName="Border" Property="BorderBrush" Value="#606060" />
          </Trigger>
          <Trigger Property="IsEnabled" Value="false">
            <Setter TargetName="Border" Property="Background" Value="#EEEEEE" />
            <Setter TargetName="Border" Property="BorderBrush" Value="#AAAAAA" />
            <Setter Property="Foreground" Value="#888888"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

Answer 1

in your Widow1.xaml (or your App.xaml, changing to ) ......

<Window1.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="DefaultStyles.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Window1.Resources>