public MainWindow()
{
InitializeComponent();
p = new Presenter(this);
p.LoadData();
btnAddDep.Click += delegate { p.AddDepartment(); };
btnAddEmp.Click += delegate { p.AddEmloyee(); };
btnEditDep.Click += delegate
{
new EditDepartmentWindow(DepartmentView.SelectedItem as Department).ShowDialog();
};
}