OnlineMonitorSystem/HandyControl/HandyControl_Shared/Themes/Styles/Base/AutoCompleteTextBoxBaseStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
                    xmlns:hc="clr-namespace:HandyControl.Controls">

    <Style x:Key="AutoCompleteTextBoxItemBaseStyle" TargetType="ComboBoxItem">
        <Setter Property="Padding" Value="{StaticResource DefaultControlPadding}"/>
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="BorderBrush" Value="Transparent"/>
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}"/>
        <Setter Property="Focusable" Value="False"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ComboBoxItem">
                    <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                    </Border>
                    <ControlTemplate.Triggers>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="False"/>
                                <Condition Property="IsMouseOver" Value="True"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource SecondaryRegionBrush}"/>
                        </MultiTrigger>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource PrimaryBrush}"/>
                            <Setter Property="Foreground" Value="White"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="AutoCompleteTextBoxBaseStyle" TargetType="hc:AutoCompleteTextBox">
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Background" Value="{DynamicResource RegionBrush}"/>
        <Setter Property="hc:BorderElement.CornerRadius" Value="{StaticResource DefaultCornerRadius}"/>
        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="CaretBrush" Value="{DynamicResource PrimaryTextBrush}"/>
        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
        <Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}"/>
        <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
        <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
        <Setter Property="Padding" Value="{StaticResource DefaultInputPadding}"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
        <Setter Property="ItemContainerStyle" Value="{StaticResource AutoCompleteTextBoxItemBaseStyle}"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="hc:Empty.ShowEmpty" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="hc:AutoCompleteTextBox">
                    <hc:SimplePanel>
                        <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                            <TextBox x:Name="PART_SearchTextBox" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" CaretBrush="{TemplateBinding CaretBrush}" Padding="{TemplateBinding Padding}" Style="{StaticResource ComboBoxEditableTextBox}"/>
                        </Border>
                        <Popup x:Name="PART_Popup" AllowsTransparency="true" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
                            <Border BorderThickness="0,1,0,0" Effect="{StaticResource EffectShadow2}" Margin="8,0,8,8" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" MinWidth="{Binding ActualWidth, ElementName=toggleButton}" MaxHeight="{TemplateBinding MaxDropDownHeight}" BorderBrush="{DynamicResource BorderBrush}" Background="{DynamicResource RegionBrush}">
                                <hc:ToggleBlock IsChecked="{Binding HasItems,RelativeSource={RelativeSource TemplatedParent},Mode=OneWay}" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
                                    <hc:ToggleBlock.CheckedContent>
                                        <ScrollViewer Margin="0,4">
                                            <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                        </ScrollViewer>
                                    </hc:ToggleBlock.CheckedContent>
                                    <hc:ToggleBlock.UnCheckedContent>
                                        <hc:Empty/>
                                    </hc:ToggleBlock.UnCheckedContent>
                                </hc:ToggleBlock>
                            </Border>
                        </Popup>
                    </hc:SimplePanel>
                    <ControlTemplate.Triggers>
                        <Trigger Property="HasItems" Value="false">
                            <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
                        </Trigger>
                        <Trigger Property="hc:DropDownElement.ConsistentWidth" Value="True">
                            <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=PART_SearchTextBox}"/>
                            <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=PART_SearchTextBox}"/>
                        </Trigger>
                        <Trigger Property="hc:DropDownElement.AutoWidth" Value="True">
                            <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{x:Static system:Double.MaxValue}" />
                            <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualHeight, ElementName=PART_SearchTextBox}" />
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="true" SourceName="PART_SearchTextBox">
                            <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsMouseOver" Value="true"/>
                                <Condition Property="IsFocused" Value="false" SourceName="PART_SearchTextBox"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
                        </MultiTrigger>
                        <Trigger Property="IsFocused" Value="True" SourceName="PART_SearchTextBox">
                            <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Opacity" Value="0.4"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>