//FECHA FORM E LISTA TODOS OS USUÁRIOS
private void todosBtn_Click(object sender, EventArgs e)
{
this.Close();
ContaUsuSist FormContaUsuSist = new ContaUsuSist("");
FormContaUsuSist.Show();
}
//FORMULÁRIO - CONTAS DO SISTEMA
private void AccBtn_Click(object sender, EventArgs e)
{
btn_disabler();
ContaUsuSist NewsForm = new ContaUsuSist("");
this.AddOwnedForm(NewsForm);
NewsForm.Show();
}