2 different colored borders around TextBox - xaml

Question

I want to do create static style where TextBox element will have 2 different colored borders around it. Can I achieve this?
I already have rounded textbox with 1 border, but I'm clueless how to add another around it.
<Style TargetType="{x:Type TextBox}" x:Key="RoundTextBox">
<Style.Resources>
<Style TargetType="{x:Type Border}">
<Setter Property="CornerRadius" Value="3"/>
</Style>
</Style.Resources>
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
<GradientStop Color="#FF32C17C"/>
<GradientStop Color="#FF01312F" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="Foreground" Value="White"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="BorderBrush" Value="#FF69FF55"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="FontWeight" Value="Medium"/>
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="Margin" Value="20,10,0,-5"/>
</Style>
This is my code for textbox style.
Thank you for all answers :)

Answer 1

You can change control template of the textbox and define another border inside the border.
<Window.Resources>
<Style TargetType="{x:Type TextBox}">
<Setter Property="MinWidth" Value="120" />
<Setter Property="MinHeight" Value="20" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<Border
BorderBrush="Red"
BorderThickness="1"
CornerRadius="2">
<Border
Name="Border"
Background="White"
BorderBrush="Gray"
BorderThickness="1"
CornerRadius="2">
<ScrollViewer x:Name="PART_ContentHost" Margin="0" />
</Border>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<TextBox
HorizontalAlignment="Center"
VerticalAlignment="Center"
Text="Test" />
</Grid>
Here is the result!
For more information about textbox styles and templates you can click here.