/// <summary>
/// Called when a selection of the structure has changed.
/// </summary>
protected virtual void onTypeChanged(object sender, System.EventArgs e)
{
ElectricPoleContribution contrib = (ElectricPoleContribution)typeBox.SelectedItem;
using (PreviewDrawer drawer = contrib.createPreview(preview.Size)) {
if (previewBitmap != null)
{
previewBitmap.Dispose();
}
preview.Image = previewBitmap = drawer.createBitmap();
}
recreateController();
}