/// <summary> Event handler for clicking with the left button on the text block showing the layer name. Shows
/// the settings dialog on mouse up. </summary>
/// <param name="sender"> Sender of the MouseLeftButtonUp event. </param>
/// <param name="e"> The event parameters. </param>
private void textBlock_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
layers.ShowSettingsDialog(layers[(sender as TextBlock)?.Tag as string]);
LayersExpander.IsExpanded = false;
}