MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:scottPlot="clr-namespace:ScottPlot.Avalonia;assembly=ScottPlot.Avalonia"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="CandleChartSample.MainWindow"
        WindowStartupLocation="CenterScreen"
        Title="CandleChartSample">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <Grid Grid.Row="0" HorizontalAlignment="Left" Margin="10" Grid.ColumnSpan="2">

            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>

            <TextBlock Grid.Column="0" Text="Symbol" Margin="5" FontSize="12" VerticalAlignment="Center" />
            <TextBox x:Name="SymbolTextBox"
                     Grid.Column="1"
                     Text="AAPL{=d}"
                     FontSize="12"
                     Width="180"
                     Margin="5"
                     KeyDown="OnKeyDown"
                     LostFocus="OnLostFocus" />

            <TextBlock Grid.Column="2" Text="From Time" Margin="5" FontSize="12" VerticalAlignment="Center" />
            <TextBox x:Name="FromTimeTextBox"
                     Grid.Column="3"
                     FontSize="12"
                     Width="180"
                     Margin="5"
                     KeyDown="OnKeyDown"
                     LostFocus="OnLostFocus" />
        </Grid>

        <Grid Grid.Row="1" Grid.Column="0">
            <scottPlot:AvaPlot Name="AvaPlot" />
        </Grid>

    </Grid>

</Window>