private void newViewToolStripMenuItem_Click(object sender, EventArgs e)
{
BookListForm bookListForm = new BookListForm(MainDocument);
bookListForm.MdiParent = this;
bookListForm.Show();
ChangeLayout();
}
public MainForm()
{
InitializeComponent();
IsMdiContainer = true;
BookListForm bookListForm = new BookListForm(MainDocument);
bookListForm.MdiParent = this;
bookListForm.Show();
ChangeLayout();
}