How do I set WPF textbox focus colour to red

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I have a dialog box. There is a text box inside the dialog box.When we open the dialogbox it should be focused and focus colour should be green, not blue(by default colour is blue)

i don't want <scrollviewer x:name="PART_ContentHost"> .but if I remove this my app name will disappear.

make this code cleaner with my requirements
requirements are:-
should highlight the textbox
highlight colour should be green
text content is App Name
isreadonly

What I have tried:

<textbox x:name="textBox" foreground="#00ff00" text="App Name" textwrapping="Wrap" grid.columnspan="2" isreadonly="True">
<textbox.style>

<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<Border x:Name="bg" BorderBrush="#55E41B" BorderThickness="2" Background="Black" FocusManager.FocusedElement="{Binding ElementName=textBox }">
<ScrollViewer x:Name="PART_ContentHost" />
</border>

</controltemplate>
</setter.Value>
</setter>

Posted 9-Dec-20 20:27pm

john321a

Updated 9-Dec-20 21:09pm

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TheRealSteveJudge · Answer 1 · 2020-12-09T21:09:00

In order to achieve this you should have an understanding how a WPF TextBox is actually constructed.
See here:wpf/TextBox.xaml at c271205b80c27df976acbd7236ec637090d127c1 · dotnet/wpf · GitHub[^]
According to this you can change the border colour by using a trigger which reacts on the IsFocused property.

XAML

<Style TargetType="TextBox">
	<Setter Property="Template">
		<Setter.Value>
			<ControlTemplate TargetType="{x:Type TextBox}">
				<Border x:Name="Border" 
						BorderBrush="{TemplateBinding BorderBrush}" 
						BorderThickness="{TemplateBinding BorderThickness}" 
						Background="{TemplateBinding Background}">
					<ScrollViewer x:Name="PART_ContentHost" 
								  Focusable="false" 
								  HorizontalScrollBarVisibility="Hidden" 
								  VerticalScrollBarVisibility="Hidden">
					</ScrollViewer>
				</Border>
				<ControlTemplate.Triggers>
					<Trigger Property="IsFocused" Value="true">
						<Setter Property="BorderBrush" 
								TargetName="Border" 
								Value="Green">
						</Setter>
					</Trigger>
				</ControlTemplate.Triggers>
			</ControlTemplate>
		</Setter.Value>
	</Setter>
</Style>

Now it's up to you to set the IsFocused property to true,
when starting the dialogue.