iv>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="keyword">using </span>Avalonia.Controls;</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="keyword">using </span>Avalonia.Controls.ApplicationLifetimes;</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="keyword">using </span>Avalonia.Markup.Xaml;</div>
<div class="line"><a id="l00022" name="l00022"></a><