void layers_LayerSelectabilityChanged(object sender, LayerChangedEventArgs e)
{
foreach (var checkBox in LayersStack.Children.Cast <UIElement>()
.OfType <CheckBox>()
.Where(checkBox => Grid.GetColumn(checkBox) == 3 && checkBox.Tag.ToString() == e.LayerName))
{
checkBox.IsChecked = layers.IsSelectable(layers[e.LayerName]);
}
}