WPF - blending style defined in the dictionary with the style defined in parental control

Question

I define the user appearance of the Button control in the resource dictionary:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Style TargetType="Button" x:Key="BaseButtonStyle">
    <Setter Property="Background" Value="Blue"/>
  </Style>
</ResourceDictionary>

Then I try to change the style in the window, the buttons were located.

<Window.Resources>
  <ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
      <ResourceDictionary Source="Dictionary.xaml"/>
      <ResourceDictionary>
        <Style TargetType="Button" BasedOn="{StaticResource BaseButtonStyle}">
          <Setter Property="Foreground" Value="Red"/>
        </Style>
      </ResourceDictionary>
      </ResourceDictionary.MergedDictionaries>   
    </ResourceDictionary>
</Window.Resources>

In the WPF designer, I have what I expected. Blue button with red text. But at runtime, both styles are not applied, and the button has default colors. How can i fix this?

Answer 1

It works below. I just moved the style from MergedDictionaries and put it in an external ResourceDictionary.

<Window.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Dictionary.xaml"/>
        </ResourceDictionary.MergedDictionaries>

        <Style TargetType="Button" BasedOn="{StaticResource BaseButtonStyle}">
            <Setter Property="Foreground" Value="Red"/>
        </Style>
    </ResourceDictionary>
</Window.Resources>

XAML , , WPF . MSDN , :

ResourceDictionary , . ResourceDictionary ( , ), URI, Source.

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