PDFOffice_Windows_exe/PDF Office/Views/Dialog/ServiceDialog/LoginDialog.xaml

<UserControl
    x:Class="PDF_Office.Views.Dialog.ServiceDialog.LoginDialog"
    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:local="clr-namespace:PDF_Office.Views.Dialog.ServiceDialog"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:prism="http://prismlibrary.com/"
    prism:ViewModelLocator.AutoWireViewModel="True" 
    Width="586"
     prism:Dialog.WindowStyle="{StaticResource DialogWindowStyle}"
    Height="420"
    mc:Ignorable="d">
    <Grid Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="260"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid Background="#273C62"/>
        <Grid Grid.Column="1" >
            <ContentControl prism:RegionManager.RegionName="{Binding LoginRegionName}" Visibility="Visible"/>
        </Grid>
    </Grid>
</UserControl>