Redmine/RedmineOracle/pgAuthRm.xaml

<Page x:Class="RedmineOracle.pgAuthRm"
      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:RedmineOracle"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="pgAuthRm"
      xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes">

    <Grid>
        <StackPanel Orientation="Vertical" VerticalAlignment="Center" HorizontalAlignment="Center">
            <TextBox x:Name="tbLogin" materialDesign:HintAssist.Hint="Логин" Width="200px"/>
            <TextBox x:Name="tbPass"  materialDesign:HintAssist.Hint="Пароль" Width="200px" Margin="0 15"/>
            <Button x:Name="btnAuth" Content="Войти" Click="btnAuth_Click" />
        </StackPanel>
    </Grid>
</Page>