R – wpf command custom control binding xaml

i'm building a Videoplayer custom control (Project called WpfCustomControlLibrary1) and want to add a Load Command.

This is what i have added in my class to get this Command:

Public Class VideoPlayer
Inherits Control
...
Public Shared ReadOnly LoadCommad As RoutedUICommand
....

Shared Sub New()
    'This OverrideMetadata call tells the system that this element wants to provide a style that is different than its base class.
    'This style is defined in Themes\Generic.xaml
    DefaultStyleKeyProperty.OverrideMetadata(GetType(VideoPlayer), New FrameworkPropertyMetadata(GetType(VideoPlayer)))

    LoadCommad = New RoutedUICommand("Load", "Load Video", GetType(VideoPlayer))
    CommandManager.RegisterClassCommandBinding(GetType(VideoPlayer), New CommandBinding(LoadCommad, AddressOf OnLoadExecuted))
End Sub
...

And this is how i call it from my XAML:

<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfCustomControlLibrary1">
.....
<Button Command="local:VideoPlayer.LoadCommand"
        DockPanel.Dock="Right" Margin="0 5 5 0"
        Width="30" HorizontalAlignment="Left"
        Content="..." />
.....

But when i add this Usercontrol to a new Project like this:

<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:bibli="clr-namespace:EigeneControllsBibli;assembly=EigeneControllsBibli"
xmlns:uc="clr-namespace:WpfCustomControlLibrary1;assembly=WpfCustomControlLibrary1"
Title="Window1" Height="442" Width="804">
<Grid>
    <uc:VideoPlayer Source="C:\Users\Public\Videos\Sample Videos\Bear.wmv" Margin="0,106,369,0"></uc:VideoPlayer>
</Grid>

i get an error that he cant convert the string in the Attribute "Command" into an Object of the Type "System.Windows.Input.ICommand

Does somebody see whats going wrong?

Thanks for helping,
Nico