WPF TextBox Border when selected?

Question

I want to make a WPF TextBox have a DarkBlue border and thickness equal to 1. I want to make the WPF have this border ( DarkBlue, thickness set to 1 ) even when the TextBox is s

Answer 1

You have the same logic for when "IsMouseOver" True as well False. Change one and you should see something.

Answer 2

I think your problem is due to having the Trigger Property value containing TextBox. You just need the name of the property.

    <Style x:Key="ReadOnlyLargeTextBox" TargetType="{x:Type TextBox}">
        <Setter Property="Height" Value="80"/>
        <Setter Property="MaxHeight" Value="80"/>

        <Setter Property="VerticalScrollBarVisibility" Value="Visible"/>

        <Style.Triggers>
            <Trigger Property="IsFocused"  Value="True">
                <Setter Property="BorderBrush" Value="Blue"/>
                <Setter Property="BorderThickness" Value="1"/>
            </Trigger>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="BorderBrush" Value="Blue"/>
                <Setter Property="BorderThickness" Value="1"/>
            </Trigger>
        </Style.Triggers>
    </Style>

Answer 3

Check FocusVisualStyle property of the FrameworkElement object (ancestor of TextBox). It's purpose is to define style applied when an element is selected.

Answer 4

just see is this you want...

<Style x:Key="TextBoxStyle1" BasedOn="{x:Null}" TargetType="{x:Type TextBox}">
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Padding" Value="1"/>
        <Setter Property="AllowDrop" Value="true"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBox}">
                <Border x:Name="bg" BorderBrush="#FF825E5E" BorderThickness="1">
                        <ScrollViewer x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                        </Border>
                    <ControlTemplate.Triggers>

                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="BorderBrush" TargetName="bg" Value="DarkBlue"/>
                            <Setter Property="BorderThickness" TargetName="bg" Value="2"/>
                        </Trigger>
                        <Trigger Property="IsFocused" Value="True">
                            <Setter Property="BorderBrush" TargetName="bg" Value="DarkBlue"/>
                            <Setter Property="BorderThickness" TargetName="bg" Value="2"/>
                        </Trigger>

                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>