Use an usercontrol in a Window(WPF)

Question

I build an user control "Board".
I want to use it in a window(WPF) "Game". I wrote :
Board board2 = new Board();
But it doesn't work. Have I to do s.th else ?(In the XAML...)
Thanks 

Answer 1

I did what you said:
<Window x:Class="Kakuro.Game"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:UserControls"
Title="Game" Height="550" Width="700" WindowStyle="None" WindowStartupLocation="Manual" WindowState="Normal">
<Grid Name="mainGrid" Loaded="mainGrid_Loaded">
<Grid.RowDefinitions>
<RowDefinition Height="28*" />
<RowDefinition Height="140*" />
<RowDefinition Height="50*" />
<RowDefinition Height="22*" />
<RowDefinition Height="18*" />
<RowDefinition Height="42*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="39*" />
<ColumnDefinition Width="80*" />
<ColumnDefinition Width="81*" />
<ColumnDefinition Width="152*" />
<ColumnDefinition Width="74*" />
</Grid.ColumnDefinitions>
<Grid.Background>
<ImageBrush ImageSource="/Kakuro;component/Images/0001.jpg" />
</Grid.Background>
<Grid Name="btnGrid" Grid.Column="1" Grid.Row="1" Margin="0,0,15,6">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="91*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="4*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="4*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="4*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="4*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="4*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="4*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="4*"/>
</Grid.RowDefinitions>
<Image Name="btnExit" Grid.Row="0" Source="/Kakuro;component/Images/button/sortie.png" Stretch="Fill" MouseDown="btnExit_MouseDown" Cursor="Hand"></Image>
<Image Name="btnNewGame" Grid.Row="2" Source="/Kakuro;component/Images/button/nouveau%20jeu.png" Stretch="Fill" MouseDown="btnNewGame_MouseDown" Cursor="Hand"></Image>
<Image Name="pictureBox1" Grid.Row="4" Source="/Kakuro;component/Images/button/sauvegarder.png" Stretch="Fill" Cursor="Hand" MouseDown="pictureBox1_MouseDown"></Image>
<Image Name="btnOptions" Grid.Row="6" Source="/Kakuro;component/Images/button/ouverture.png" Stretch="Fill" Cursor="Hand" MouseDown="btnOptions_MouseDown"></Image>
<Image Name="btnPrint" Grid.Row="8" Source="/Kakuro;component/Images/button/imprimer.png" Stretch="Fill" MouseDown="btnPrint_MouseDown" Cursor="Hand"></Image>
<Image Name="btnSolution" Grid.Row="10" Source="/Kakuro;component/Images/button/solution.png" Stretch="Fill" Cursor="Hand"></Image>
<Image Name="btnHint" Grid.Row="12" Stretch="Fill" Source="/Kakuro;component/Images/button/remez.png" MouseDown="btnHint_MouseDown" Cursor="Hand"></Image>
</Grid>
<Label Name="p" Grid.Column="1" Grid.Row="2" ></Label>
<Label Name="label1" Grid.Column="1" Grid.Row="2" Foreground="White" FontSize="75" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="66,75,52,0" FontWeight="Bold"></Label>
<Label Name="point2" Grid.Column="4" Grid.Row="3" Content="0" Foreground="Red" FontSize="60" FlowDirection="LeftToRight" FontWeight="Bold" Grid.RowSpan="3" Height="87" VerticalAlignment="Top" HorizontalContentAlignment="Left" VerticalContentAlignment="Top"></Label>
<Label Name="lblStatusBar" Grid.Row="3" Grid.Column="2" Grid.ColumnSpan="5" ></Label>
<Label Name="statuslbl2" Grid.Row="4" Grid.Column="2" Grid.ColumnSpan="5" ></Label>
<Label Name="statuslbl3" Grid.Row="5" Grid.Column="2" Grid.ColumnSpan="5" ></Label>
<!--<Image Name="pictureBox2" Grid.Column="1" Grid.Row="5" ></Image>-->
<local:Board />
</Grid>
</Window>
and I get errors:
'local' is an undeclared prefix. Line 61, position 10.' XML is not valid.
Undefined CLR namespace. The 'clr-namespace' URI refers to a namespace 'UserControls' that is not included in the assembly.
The type 'local:Board' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.