SetSubProjectDialog.xaml

<mah:MetroWindow x:Class="ProjectManager.SetSubProjectDialog"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls"
        Title="Set as Sub-project" Height="200" Width="480"
        WindowStartupLocation="CenterOwner" ResizeMode="NoResize"
        FontSize="14">
    <Grid Margin="15">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <TextBlock Grid.Row="0" Text="Select parent project:" Margin="0,0,0,8"/>

        <ComboBox Grid.Row="1" Name="cmbParent" Height="30" Margin="0,0,0,10"
                  DisplayMemberPath="DisplayName"/>

        <StackPanel Grid.Row="3" Orientation="Horizontal" HorizontalAlignment="Right">
            <Button Name="btnOK" Content="Set Sub-project" Width="135" Height="34" Margin="5"
                    Click="BtnOK_Click" IsDefault="True"/>
            <Button Name="btnCancel" Content="Cancel" Width="90" Height="34" Margin="5"
                    Click="BtnCancel_Click" IsCancel="True"/>
        </StackPanel>
    </Grid>
</mah:MetroWindow>