//Method spawns a stock state summary window when that button is clicked private void stockStateSumaryToolStripMenuItem_Click(object sender, EventArgs e) { StockStateSummary newMDIChild = new StockStateSummary(); //Register the observer data.register(newMDIChild); // Set the parent form of the child window. newMDIChild.MdiParent = this; // Display the new form. newMDIChild.Show(); data.notify(); }