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Apply Aero style on WPF library

I want to force the Aero style on my forms. I created a "WPF Class Library" and added a form and controls to this form. As the library will be called by 3rd party C# applications running on different OS, I want to force to always apply the Aero style.
But as it is a WPF class library I have no App.xaml file where I could put my Resource Dictionary.
I placed it in a dedicated custom Styles.xaml therefore and in my form I reference it like
<Window.Resources>
<ResourceDictionary Source="Styles.xaml">
</ResourceDictionary>
</Window.Resources>
where Styles.xaml looks like
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MyLib">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/PresentationFramework.Aero;V4.0.0.0;component/themes/Aero.NormalColor.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
and is set to "Build action: Embedded resource" and is stored in the main project folder. I also added a reference to PresentationFramework.Aero in my project.
When I call my library form from the C# application, I get an error saying
Set property 'System.Windows.ResourceDictionary.Source' threw an exception.' Line number 'x' and line position 'y'
What did I do wrong?

This should work for you.
<ResourceDictionary Source="pack://application:,,,/PresentationFramework.Aero;component/themes/Aero.NormalColor.xaml" />
Refere this MSDN article for more details.
UPDATE
Include ResourceDictionary in PCL
Create a ResourceDictionary
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/PresentationFramework.Aero;component/themes/Aero.NormalColor.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
<!-- store here your styles -->
</ResourceDictionary>
You can use it from Your PCL in WPF App
<Window x:Class="Test.Window"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window"
Height="300"
Width="300">
<Window.Resources>
<ResourceDictionary Source="pack://application:,,,/Your.Base.AssemblyName;component/YourResDictionaryFolder/Dictionary1.xaml" />
</Window.Resources>
<Grid>
</Grid>
</Window>
Your.Base.AssemblyName = Dll name
YourResDictionaryFolder = Folder where you created your ResourceDictionary
Dictionary1.xaml = File name which you created above

Using a custom Library in an other custom library (Styles and Methodes)

I'm currently working on a personnal library (toolkit) to help me during my other projects.
Inside I have all my xaml style and some functions that I often use.
when I create a new application, I add my "toolkit" in the references and I add it in my app.xaml file like that :
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/ToolKit;component/styles/global.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
With that, everything is working. I just got the following error "an error occurred while finding the resourcedictionary" but when I run it my styles are good.
But when I need to create a second custom library (to integrate it in revit) I don't have any success...
I tried this link but nothing is working. I get the same error "an error occurred while finding the resourcedictionary" and when I run it I don't have my styles...
I call the styles like that :
Style="{DynamicResource Borderless}"
and I got the error "the ressource Borderless could not be resolve"
My Toolkit have the namespace "ToolKit", a folder "Styles" and all the xaml inside this folder with a "Global.xaml" that merge all the dictionaries.
How can I get my styles applied ?
thank you
Edit :
Here is the DesignTimeResources.xaml to call the style :
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/ToolKit;component/Styles/Global.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
and the Global.xaml look like this :
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ToolKit.Styles">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Windows.xaml" />
<ResourceDictionary Source="Borders.xaml" />
<ResourceDictionary Source="Buttons.xaml" />
<ResourceDictionary Source="CheckBox.xaml" />
<ResourceDictionary Source="Label.xaml" />
<ResourceDictionary Source="ListView.xaml" />
<ResourceDictionary Source="RadioButton.xaml" />
<ResourceDictionary Source="RichTextBox.xaml" />
<ResourceDictionary Source="ScrollBar.xaml" />
<ResourceDictionary Source="TextBlock.xaml" />
<ResourceDictionary Source="TextBox.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

How to include two resources in Page.Resources?

In WPF, this used to work fine:
<Page.Resources>
<ResourceDictionary Source="resources/Styles.xaml" />
</Page.Resources>
but adding a converter (see below) causes an error on the 2nd resource (Style.xaml): Each dictionary entry must have an associated key.
<Page.Resources>
<local:MySizeConverter x:Key="sizeConverter"/>
<ResourceDictionary Source="resources/Styles.xaml" />
</Page.Resources>
However, adding a key to the 2nd line (e.g. <ResourceDictionary x:Key="myStyleDict" Source="resources/Styles.xaml" /> causes the following error in code behind
The name 'aTextBlockUsedToWork' does not exist in the current context
where aTextBlockUsedToWork could be successfully accessed in code behind before adding the key. Note that the converter works fine if I comment out the style resource. How can I have both of the resources working?

You need to use MergedDictionaries to import another dictionary file, like this:
<Page.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="resources/Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
<local:MySizeConverter x:Key="sizeConverter"/>
</ResourceDictionary>
</Page.Resources>

Converting WPF local resource to application resource

I have a local resource in XAML and I want it to be used by other parts of the code. How can I make it "global" (i.e. an application-wide resource)? Here is my local resource:
<ResourceDictionary >
<local:BoolToLightConvertor x:Key="LightConverter" / >
</ResourceDictionary>
How can I put this in the App.xaml?

Application Resources
In addition to defining resources at the level of the element or Window, you can define
resources that are accessible by all objects in a particular application. You can create an application
resource by opening the App.xaml file (for C# projects) or the Application.xaml file
(for Visual Basic projects) and adding the resource to the Application.Resources collection, as
shown here:
<Application x:Class="WpfApplication.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="Window1.xaml">
<Application.Resources>
<SolidColorBrush x:Key="appBrush" Color="LightConverter" />
</Application.Resources>
</Application>

Create a file (e.g. SharedResources.xaml) as follows:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Your.Namespace.Here;assembly=Your.Assembly.Here">
< local:BoolToLightConvertor x:Key="LightConverter" / >
</ResourceDictionary>
In your App.xaml add the following lines:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="SharedResources.xaml" />
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type Rectangle}" />
</ResourceDictionary>
</Application.Resources>
You can now use this converter from within the XAML
(The <Style TargetType="{x:Type Rectangle}"/> is a workaround to stop a WPF bug ignoring your resource dictionary and was recommended by another question here on SO. The link unfortunately eludes me now though)

Referencing a resource in a ResourceDictionary from a different ResourceDictionary in Silverlight

I have the following set of code in my App.xaml:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Client.Common;component/Theme/Brushes.xaml"/>
<ResourceDictionary Source="/Client.Common;component/Theme/Fonts.xaml"/>
<ResourceDictionary Source="/Client.Common;component/Theme/CoreStyles.xaml"/>
<ResourceDictionary Source="/Client.Common;component/Theme/SdkStyles.xaml"/>
<ResourceDictionary Source="/Client.Common;component/Theme/MyAppName.xaml"/>
<ResourceDictionary Source="/Client.Common;component/Controls/NavigationPanel.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
The NavigationPanel.xaml contains a style that looks like this:
<Style x:Key="NavigationPanelListBox" TargetType="ListBox">
<Setter Property="Background" Value="{StaticResource DarkBackground}" />
<Lots of XAML>
</Style>
The {StaticResource DarkBackground} is defined in the Brushes.xaml file (i.e. the first resource dictionary). It is defined as
<SolidColorBrush x:Key="DarkBackground" Color="#FF707176" />
in the resource dictionary.
At runtime, I get the following error:
Cannot find a Resource with the Name/Key DarkBackground [Line: 16 Position: 44]
The line numbers and position references the NavigationPanel.xaml resource dictionary in the app.xaml.
I can reference the brush from other controls, just not the included resource dictionary.
Why can I not reference or why does it not resolve the reference to a resource that is higher in the heirarchy of the merged resource dictionary?? What am I missing here?

Are you referencing the DarkBackground brush in any of the resources in the NavigationPanel dictionary?
If you are you might need to merge the Brushes resource dictionary into the NavigationPanel dictionary.
So in the NavigationPanel dictionary.
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Client.Common;component/Theme/Brushes.xaml" />
</ResourceDictionary.MergedDictionaries>

You can include one dictionary in another (like 'using' in C#) like so:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
xmlns:uriMapper="clr-namespace:System.Windows.Navigation;assembly=System.Windows.Controls.Navigation"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:Controls="clr-namespace:APC.IKM.UI.SL.Controls"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Brushes.xaml"/>
<ResourceDictionary Source="Fonts.xaml"/>
<ResourceDictionary Source="CoreStyles.xaml"/>
</ResourceDictionary.MergedDictionaries>
Is this what you are looking for? The Cosmopolitan / Metro project template has a good example of this...

the trully answer is Eric's answer in this site: https://social.msdn.microsoft.com/forums/windowsapps/en-US/2be9a5f6-5313-448d-a9d9-296bac42215e/using-style-defined-in-merged-dictionary-from-another-merged-dictionary?forum=wpdevelop.
the Brushes.xaml and the NavigationPanel.xaml is parsed independently and then added to the merged dictionary of Application resources so they don't know anything about each other.