<ControlTemplate TargetType="{x:Type TextBox}">
                        <Grid>
                            <Border x:Name="border" CornerRadius="7" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                                <Border.Effect>
                                    <DropShadowEffect/>
                                </Border.Effect>
                            </Border>
                            <Border CornerRadius="7" BorderBrush="Transparent" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" SnapsToDevicePixels="True">
                                <ScrollViewer x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
                            </Border>
                        </Grid>
                        <ControlTemplate.Triggers>
                        <!-- и так далее -->