src/StructuredLogViewer.Avalonia/Controls/SearchAndResultsControl.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:StructuredLogViewer.Avalonia.Controls;assembly=StructuredLogViewer.Avalonia"
             x:Class="StructuredLogViewer.Avalonia.Controls.SearchAndResultsControl">
    <DockPanel>
        <Grid DockPanel.Dock="Top">
            <TextBox Name="searchTextBox"
                     MinHeight="23"
                     BorderThickness="0,0,0,1" />
            <Path Name="magnifyingGlass"
                  Data="{DynamicResource SearchGeometry}"
                  Fill="#717171"
                  HorizontalAlignment="Right"
                  VerticalAlignment="Center"
                  Margin="3"
                  IsVisible="{Binding #searchTextBox.Text, Converter={x:Static StringConverters.IsNullOrEmpty}}" />
            <Button Name="clearSearchButton"
                    Classes="close"
                    HorizontalAlignment="Right"
                    VerticalAlignment="Stretch"
                    Margin="0,0,0,1"
                    Width="20"
                    IsVisible="{Binding #searchTextBox.Text, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
        </Grid>

        <Grid>
            <TreeView Name="resultsList"
                      BorderThickness="0"
                      Background="#F5F5F5" />
            <ContentPresenter Name="watermark"
                              Margin="40"
                              HorizontalAlignment="Center"
                              VerticalAlignment="Center">
                <ContentPresenter.Styles>
                    <Style Selector="TextBlock">
                        <Setter Property="TextWrapping"
                                Value="Wrap" />
                        <Setter Property="Foreground"
                                Value="Gray" />
                    </Style>
                </ContentPresenter.Styles>
            </ContentPresenter>
        </Grid>
    </DockPanel>

</UserControl>