BPASmartClient/BPASmartClient.CustomResource/UserControls/WatermarkText.xaml

<UserControl
    x:Class="BPASmartClient.CustomResource.UserControls.WatermarkText"
    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:BPASmartClient.CustomResource.UserControls"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="30"
    d:DesignWidth="100"
    mc:Ignorable="d">

    <Border
        Background="{Binding WTBackground}"
        BorderBrush="{Binding Stroke}"
        BorderThickness="{Binding StrokeThickness}"
        CornerRadius="{Binding WTCornerRadius}">
        <Grid>
            <TextBox
                Name="Maintb"
                Margin="5,0,0,0"
                Background="Transparent"
                BorderThickness="0"
                Text="{Binding Text}" />
            <TextBlock
                Name="Subtb"
                Margin="5,0,0,0"
                HorizontalAlignment="Left"
                VerticalAlignment="Center"
                Background="Transparent"
                Foreground="{Binding SubForeground}"
                IsHitTestVisible="False"
                Text="{Binding SubText}" />
        </Grid>

    </Border>
</UserControl>