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Unable to use TextBox after including MaterialDesignInXaml

I'm building a library (plugin for Revit). I have a Window in which I have included Material design successfully.
When I try adding TextBox control to this Window, I get the following error
System.Windows.Markup.XamlParseException: 'Provide value on 'System.Windows.Markup.StaticResourceHolder' threw an exception.'
Inner Exception: NotImplementedException: The method or operation is not implemented.
Since I'm building a library, I don't have an App.xaml file, so I created a resource dictionary with the following content:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepPurple.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
I include it to my Window using
<Window.Resources>
<ResourceDictionary Source="/MyAsembly;component/MaterialDesign.xaml" />
</Window.Resources>
As I said, using plain simple TextBox throw an exception, no styles, no anything
<TextBox />
All the other WPF controls that I've used so far work normally after including Material design in a window/page.
I have another Window in the same app where I already have TextBox. If I try including MaterialDesign to that Window, I get the same error; without MaterialDesing, TextBox works normally. If I include MaterialDesing and comment out the TextBox, the code works normally.
Any help is highly appreciated.
EDIT: Demo app that demonstrates the problem can be found here.

You must also provide the XAML namespace along with your ResourceDictionary declaration as shown below.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepPurple.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

put this line to your main window tag
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"

MahApps and Property Grid

First of all, great thanks to MahApps. What a cool project!
I have an existing application written in WPF that I have applied the MahApps library to. I used this tutorial:
http://mahapps.com/guides/quick-start.html
However the effect on the Property Grid (Xceed) is minimal.
The combo boxes in my other windows look like this:
The property grid combo boxes still look like this (ugly!):
However clicking on a combo box shows the right MahApps style for the items. It is only the Combo Box itself (closed) that is not flat.
My knowledge on WPF is basic. Where would I start to try and fix this? Do I need to manually override the combo box template in the Property Grid?

in MainWindow.xaml use Controls:MetroWindow
<Controls:MetroWindow x:Name="MainApp" x:Class="AppWin.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
MinHeight="700"
MinWidth="1024"
>
in MainWindow.xaml.cs inheritance MetroWindow
namespace AppWin
{
public partial class MainWindow : MetroWindow
{
...
add App.xaml following settings
<Application x:Class="AppWin.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:AppWin"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<!-- MahApps.Metro resource dictionaries. Make sure that all file names are Case Sensitive! -->
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
/*--change template color for example green.xaml--*/
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/red.xaml" />
/*--change template style for example BaseDark.xaml--*/
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>

Perhaps your other combobox looks ugly because the MahApps resources is not found?
Place the mahapp resources you are using in a resource dictionary in the App.xaml file so it will be accessible for all windows. (and not place them in a resource dictionary in only one window, ie. mainwindow.xaml)
App.xaml:
<Application... >
<Application.Resources>
<ResourceDictionary>
<!-- My other resources -->
<!-- ... -->
<!-- MahApps resources -->
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.AnimatedSingleRowTabControl.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseDark.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>

The property grid overrides the styles of MahApps. You have to create a own PropertyEditor for your properties. The PropertyEditor overrides the styles of the property grid.
I know thats a lot of work, but its the only way to get the MahApps look.

WPF MahApps Change style of Window notworking for elements inside its UserControl

I added MahApps resources like in App.xaml:
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.AnimatedTabControl.xaml" />
<!-- accent resource -->
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/blue.xaml" />
<!-- theme resource -->
<!-- change "BaseLight" to the theme you want -->
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/basedark.xaml" />
</ResourceDictionary.MergedDictionaries>
....
It works well on all of my windows but i have a special window (WindowA) that i want be in a different color so i added the MahApps resources to this window
WindowA.xaml:
<controls:MetroWindow.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.AnimatedTabControl.xaml" />
<!-- accent resource -->
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/blue.xaml" />
<!-- theme resource -->
<!-- change "BaseLight" to the theme you want -->
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/basedark.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</controls:MetroWindow.Resources>
Now i want apply my accent color dynamically to it, so i use some codes like this:
ThemeManager.ChangeAppStyle(appOrWindow,
ThemeManager.GetAccent("Amber"),
ThemeManager.GetAppTheme("basedark"));
The result is cool for title bar color (Amber color) of the WindowA BUT i have a label (Lable 1) in a UserControl (TestUserControl) inside WindowA and its color is Blue yet!
WindowA > TestUserControl > Lable 1
The lable 1 xaml tag inside TestUserControl:
<Label Foreground="{StaticResource AccentColorBrush}">Lable1</Label>
I want change all element colors with {StaticResource AccentColorBrush} Foreground color to Amber include all elements inside UserControls of the WindowA with AccentColorBrush StaticResource.
I think the UserControl is using MahApps resources declared in App.xaml. How can i force it to use MahApps resources declared in WindowA.xaml.
How can i fix this?
Edit1
If i apply an accent like Red to the Application the label 1 color will be changed to the Red color.

Add this to the UserControl.Resources
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/amber.xaml" />

You should use DynamicResource instead StaticResource for the foreground.
<Label Foreground="{DynamicResource AccentColorBrush}">Lable1</Label>
Hope that helps.

VSTO Excel Add-In - WPF XAML Style issue

I am creating VSTO Office Excel-Add-In in which am popping up a simple WPF window. This window is styled with MahApps library. The issue is that no matter which approach I use, Icons while showing fine in the Visual Studio preview, during Debug they are missing. The Icons.xaml which is responsible for showing Icons is installed in Resources folder, with Build action set to Page. Any thoughts about this issue?
<Controls:MetroWindow.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.AnimatedSingleRowTabControl.xaml" />
<ResourceDictionary Source="pack://application:,,,/ExcelAddIn;component/Resources/Icons.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Controls:MetroWindow.Resources>
I've tried also, without any success:
<ResourceDictionary Source="/ExcelAddIn;component/Resources/Icons.xaml" />
<ResourceDictionary Source="pack://application:,,,/component/Resources/Icons.xaml" />

Applying MahApps.Metro Dark theme

I am relatively new to WPF and I am trying to apply Windows Metro Dark theme to my entire application.
I used the following in my Apps.xaml and I can see the Windows Metro Light theme properly.
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
Now I want to change the theme to Dark. I understand I can always use,
ThemeManager.ChangeTheme()
But I believe there should be a way to do this with XAML effective to all the windows of the application.
My Question : Can someone point me how to do this without using ThemeManager in source code?

Try to use BaseDark instead of BaseLight. Try to change this line :
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
to this :
<ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseDark.xaml" />
That did the trick for me. Screenshot of my application using MahApps BaseDark and BaseLight accents:
BaseDark
BaseLight