private void toolStripButton2_Click(object sender, EventArgs e)
 {
     FrmExportacion EXP = new FrmExportacion();
     EXP.MdiParent = this;
     OpenSubForm(EXP);
 }
 private void ToolExportación_Click(object sender, EventArgs e)
 {
     FrmExportacion EXP = new FrmExportacion();
     EXP.MdiParent = this;
     OpenSubForm(EXP);
 }