public static frmRelatorios GetChild(mdiPrincipal parent = null) { if (_childInstance == null) { _childInstance = new frmRelatorios(); _childInstance.MdiParent = parent; } return(_childInstance); }
private void btnRelatorios_Click(object sender, EventArgs e) { frmRelatorios frm = frmRelatorios.GetChild(this); frm.Show(); }