private void button_entity_mark_type_Click(object sender, EventArgs e)
{
Editor editor = ActiveDocument;
Level level = editor.m_level;
Entity entity = level.GetSelectedEntity();
if (entity != null)
{
editor.SaveStateForUndo("Mark entities of same type");
int num = level.MarkEntitiesOfType(entity.Type);
ActiveDocument.AddOutputText("Marked " + num + " " + entity.Type.ToString() + " entities.");
editor.RefreshGeometry();
}
}