inabox/inabox.wpf/DynamicGrid/MultiSelectWindow.xaml

<wpf:ThemableWindow
    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:syncfusion="http://schemas.syncfusion.com/wpf" x:Class="InABox.DynamicGrid.MultiSelectWindow"
    xmlns:wpf="clr-namespace:InABox.Wpf"
    mc:Ignorable="d"
    Title="Select Items" Height="500" Width="350" WindowStartupLocation="CenterOwner">
    <Grid Background="WhiteSmoke">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="80" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="80" />
            <ColumnDefinition Width="80" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="40" />
        </Grid.RowDefinitions>
        <syncfusion:CheckListBox x:Name="Items" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="4" Margin="5,5,5,0"
                                 BorderThickness="0.75" BorderBrush="Silver" Background="White"
                                 DisplayMemberPath="Value" SelectedValuePath="Key" />
        <Button x:Name="SelectAll" Grid.Row="1" Grid.Column="0" Margin="5,5,0,5" Content="Select All"
                Click="SelectAll_Click_1" />
        <Button x:Name="OKButton" Grid.Row="1" Grid.Column="2" Margin="0,5,5,5" Content="OK" Click="OKButton_Click" />
        <Button x:Name="CancelButton" Grid.Row="1" Grid.Column="3" Margin="0,5,5,5" Content="Cancel"
                Click="CancelButton_Click" />
    </Grid>
</wpf:ThemableWindow>