private void historicoDeConsumoToolStripMenuItem_Click(object sender, EventArgs e)
{
if (telaPesquisarHistorico == null)
{
telaPesquisarHistorico = new Pesquisa_Historico();
telaPesquisarHistorico.MdiParent = this;
telaPesquisarHistorico.Show();
telaPesquisarHistorico.Disposed += new EventHandler(telaPesquisarHistorico_Disposed);
}
}
void telaPesquisarHistorico_Disposed(object sender, EventArgs e)
{
telaPesquisarHistorico = null;
}
