problem in user control shortcut key in wpf

Hi,

     i have problem in user control shortcut key..in my project i have expander if i click expander button i will show user control in ContentControl.. i have 2 button in user control and i set shortcut keys but it not working...in wpf window form it work...and my coding .....but i got 2 error as..

Error    1    Unknown build error, 'Key cannot be null.
Parameter name: key Line 195 Position 49.'    

Error    2    The type or namespace name 'MyCommand' could not be found (are you missing a using directive or an assembly reference?)  

<UserControl x:Class="WpfApplication2.UserControl1"

            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"

            mc:Ignorable="d"

            d:DesignHeight="300" d:DesignWidth="300"

            xmlns:local="clr-namespace:WpfApplication2">

 <Grid>

   <Button Content="Test Command" Command="{x:Static local:UserControl1.TestCommand}"/>

 </Grid>

</UserControl>

UserControl C#:

KeyBinding:

 <Window.InputBindings>

   <KeyBinding Key="K" Modifiers="Control" Command="{x:Static local:UserControl1.TestCommand}"/>