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c# WPF AlternateContent doesn't exist in the Namespace [...]

I am facing the need to have XAML Code only in design-time. I have found a nice Solution to this, which can be found here. It seems like there are a few guys having a Problem with the parse-timing of XmlnsDefinitionAttribute which is solved here.
In my case the issue is really, that I cannot compile my code, because AlternateContent can't be found in the namespace xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006". I haven't found any documentation to this namespace indeed and it seems strange, that the line mc:Ignorable="d"doesn't fail to build, which means I have at least one assembly containing the above namespace.
This is my Code:
#if DEBUG
[assembly: XmlnsDefinition("debug-mode", "MyNamespace")]
#endif
<Window x:Class="MyNamespace.SomeWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:debug="debug-mode"
mc:Ignorable="d"
... >
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<mc:AlternateContent>
<mc:Choice Requires="debug">
<ResourceDictionary Source="pack://application:,,,/Styles;component/Generic.xaml" />
</mc:Choice>
</mc:AlternateContent>
...
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
...
</Window>
My guess is, that I'm missing an Assembly-Reference, but I've not yet found a Documentation specifying a containing Assembly for AlternateContent. Do you have any ideas how I might get this to work?
Edit:
It seems like this is a common VS Problem which can be solved by this mc:Ignorable="d mc". This just doesn't work in my case, because I would need this to include Resources at Design-Time, which should be available to the VS-Designer :)

It seems like this is a common VS problem which can be solved by this code
mc:Ignorable="d mc"
This must be added to the root element of the view.
Note: that you already should have mc:Ignorable="d" in your root element, so you have to just add the mc to it.

VSIX CS0426 The type name Views does not exist in the type 'ABC'

I'm creating a VSIX plug-in and just added a WPF control like this:
<UserControl x:Class="ABC.Views.Configuration.MyControl"
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"
xmlns:local="clr-namespace:ABC.Views.Configuration"
mc:Ignorable="d"
Loaded="UserControl_Loaded"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
</Grid>
</UserControl>
When I compile the project I am getting the error:
CS0426 The type name Views does not exist in the type 'ABC'
I've checked the projects' default namespace and other relevant configurations and everything looks good. In fact, I have other User Controls in the same directory that are compiling just fine.
What am I doing wrong?

The root cause of this problem was this line in XAML above:
Loaded="UserControl_Loaded"
For some reason VSIX doesn't like wiring events in XAML. I simply removed this and wired it up in Code-behind

Unable to load DLL in the WPF-project

I do have a UserControl (works) which I would like to use in a WPF project. When I run the application I get following error
Unable to load DLL 'VCECLB.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)"
This is a C++ dll and if I add it under references it goes to the project folder like this:
I also add it in the output folder \bin\x64\Release but without success. What I am doing wrong here? Any feedback would be highly appreciated!
UPDATE:
The XAML for loading the UserControl looks like this:
<Window x:Class="WpfApplication1LL_Neu.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:lowLightGrab="clr-namespace:LowLightGrab;assembly=LowLightGrab"
Title="MainWindow" Height="350" Width="525">
<Grid>
<WindowsFormsHost Height="290" HorizontalAlignment="Left" Margin="16,10,0,0" Name="windowsFormsHost1" VerticalAlignment="Top" Width="475">
<lowLightGrab:UserControl1/>
</WindowsFormsHost>
</Grid>
</Window>
Thanks

Once added as reference it will be copied to output folder.
For design time you have to add in your Window:
xmlns:VCECLB="clr-namespace:VCECLB;assembly=VCECLB"

Adding x:Name to a user control gives error in generated code of page its used in

I am basically using a user control for the first time, so hopefully it's just a dumb mistake.
I have a simple user control
<UserControl x:Class="TestProject.WebApp.myUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:riaControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.DomainServices"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">
<Grid>
<sdk:AutoCompleteBox Name="myACB" ItemsSource="{Binding Data}" FilterMode="StartsWith" MinimumPrefixLength="2" >
</sdk:AutoCompleteBox>
</Grid>
</UserControl>
I am using the control in another page (in a stack panel):
<navigation:Page x:Class="TestProject.WebApp.myPageView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:local="clr-namespace:TestProject.WebApp"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation">
<Grid>
<StackPanel Orientation="Horizontal">
<local:myUserControl x:Name="myUC" />
</StackPanel>
</Grid>
</navigation:Page>
The control is in the same namespace as page. Removing the x:Name allows the project to compile and the control functionally works. When x:Name is specified I get an error in the generated code of the page:
Type 'TestProject.WebApp.myUserControl' is not defined.
It happens on these lines of code:
internal TestProject.WebApp.myUserControl myUC;
this.myUC == (TestProject.WebApp.myUserControl)this.FindName("myUC")
I tried with two different controls. Same thing. The generated code has "using TestProject.WebApp;" so I don't know why there is an error only when I have a named instance of the control.
I also cannot seem to use just the Name property. I even tried overloading the NameProperty in the control.

I was able to find a post about this here:
.g.vb file claims that Type X is not defined, even though it is!
Apparently, there is an issue when a project has a service reference (in my case I am using RIA services) and the user control resides in an assembly with the same root namespace as the one you are trying to use it in.
So for me it was,
TestProject.WebApp
Then I tried creating a new project for just the control
TestProject.Controls
Same problem.
Then, when I renamed the project and changed the namespace to
CustomControls
it worked.
Hopefully this saves someone else from some frustration and I really hope this problem can be fixed by MS soon.

What you are showing here should work. What is the default namespace in your project property's? Also did you rename your user control after you created it. Both of those issues could be causing you problems.

Using ICSharpCode.AvalonEdit on .Net 3.5?

I'm trying to use the ICSharpCode.AvalonEdit.TextEditor control from the SharpDevelop 4.0 project in a WPF app that I'm building, but I can't seem to get it to work.
I checked out a copy of the source code from svn://svnmirror.sharpdevelop.net/sharpdevelop/trunk/SharpDevelop/src/Libraries/AvalonEdit at revision 4304. Then, I built the project using Visual Studio 2008 SP1, which succeeded without errors.
I then created a blank new WPF project, added the build DLL to the toolbox and dropped the TextEditor control onto the default empty window, like so:
<Window x:Class="AvalonEditTest.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:avalonedit="http://icsharpcode.net/sharpdevelop/avalonedit"
Title="Window1" Height="300" Width="300" >
<Grid x:Name="LayoutRoot">
<avalonedit:TextEditor Name="textEditor" />
</Grid>
</Window>
However, when I run the project, the form comes up completely blank. No caret, the mouse cursor stays the default pointer, and the window does not respond to keypresses.
Am I missing something, or is AvalonEdit just a little broken?
[EDIT: I'm starting to think it might be related to my specific setup. I'm running the 64-bit Windows 7 RC. Might that have something to do with it? I've tried building it for x86 only, made no difference.]

Are you sure your namespace declaration is correct?
You can try something like this:
<Window x:Class="Editor.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300"
xmlns:e="clr-namespace:ICSharpCode.AvalonEdit;assembly=ICSharpCode.AvalonEdit">
<Grid>
<e:TextEditor x:Name="Editor" WordWrap="True" Height="200">
</e:TextEditor>
</Grid>
</Window>
I was able to get it to work without any issues.

The AvalonEdit TextEditor is just a view for a TextDocument model.
The problem was that a new AvalonEdit instance didn't start connected to any model instance, so there wasn't anything to edit.
The reason the code from statictype worked was that he didn't use <avalonedit:TextEditor/>, but <avalonedit:TextEditor></avalonedit:TextEditor>. This will assign an empty string to the Text property, which caused the editor to implicitly create a new document.
But this isn't relevant with recent AvalonEdit versions anymore, the editor will now always create a new TextDocument.

This works for me with the latest build
<DockPanel LastChildFill="True">
<avalonedit:TextEditor
HorizontalAlignment="Stretch"
Name="textEditor1"
VerticalAlignment="Stretch" />
</DockPanel>