Setting styles for subcontrols of usercontrol

Say I have a user control like this:

<UserControl x:Class="StyleTest.UserControl1"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>
    <Button Grid.Row="0">Style please</Button>
    <Button Grid.Row="1">Style please</Button>
</Grid>

And I want to set all buttons in this control to background=green. But I don't want to affect other buttons in my program and I don't want to modify the code of the control.

What I found right now is this:

<Window x:Class="StyleTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:loc="c开发者_JAVA百科lr-namespace:StyleTest"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <Style x:Key="UserControlStyles" TargetType="Button">
        <Setter Property="Background" Value="green" />
    </Style>
</Window.Resources>
<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition />
    </Grid.ColumnDefinitions>
    <Button Grid.Column="0">no Style please</Button>
    <loc:UserControl1 Grid.Column="1">
        <loc:UserControl1.Resources>
            <Style TargetType="Button" BasedOn="{StaticResource UserControlStyles}" />
        </loc:UserControl1.Resources>
    </loc:UserControl1>
</Grid>

But this would imply that I have to add this code to every instance of the control, and some extra code, if I want to style e.g. foreground color of TextBoxes also.

What I am looking for is something similar to this:

        <Style TargetType="Buttons that are childs of UserControl1">
        <Setter Property="Background" Value="green" />
    </Style>

Is there a way of doing this?

I don't think that a control template would be sufficient, because I don't want to redesign the whole control, I just want to set the color of the buttons.

In App.xaml you could add this style which will be applied to all instances of UserControl1

<Style TargetType="StyleTest:UserControl1" >
   <Style.Resources>
     <Style TargetType="Button">
        <Setter Property="Background" Value="green" />
     </Style>
   </Style.Resources>
</Style>

If I understand correctly, you just need to modify your UserControl so that you add the style there, instead of in the Window control

<UserControl x:Name=UserControl1 ...>
<UserControl.Resources>
   <Style TargetType="Button">
        <Setter Property="Background" Value="green" />
   </Style>
</UserControl.Resources>

I just saw that you said you don't want to modify the control. You mean that you can't modify the xaml of the UserControl? Why not?