private void OpenListOfBills()
{
Bills bills = new Bills();
bills.MdiParent = this.MdiParent;
this.MdiParent.ActiveMdiChild.Close();
bills.Show();
}
private void billToolStripMenuItem_Click(object sender, System.EventArgs e)
{
if (_instanceBillsForm == null)
{
CloseAllForms();
_instanceBillsForm = new Bills();
_instanceBillsForm.MdiParent = this;
_instanceBillsForm.FormClosed += instanceBillsFormHasBeenClosed;
}
else
{
ShowMessage();
}
_instanceBillsForm.Show();
}
