prs/prs.desktop/Panels/Quotes/QuoteProposals.xaml

<UserControl x:Class="PRSDesktop.QuoteProposals"
             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"
             xmlns:local="clr-namespace:PRSDesktop"
             mc:Ignorable="d"
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="450" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <local:QuoteProposalGrid Grid.Column="0" x:Name="Proposals" />
        <local:QuoteProposalDetails Grid.Column="1" Margin="2,0,0,0" x:Name="Details" />
    </Grid>
</UserControl>