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