public BasicUIViewModel()
{
ButtonCommand = new RelayCommand(new Action<object>(ButtonClick));
ComboBoxSource = new List<ExampleClass>();
ComboBoxSource.Add(new ExampleClass { Name = "Item 1" });
ComboBoxSource.Add(new ExampleClass { Name = "Item 2" });
ComboBoxSource.Add(new ExampleClass { Name = "Item 3" });
ComboBoxSource.Add(new ExampleClass { Name = "Item 4" });
ComboBoxSource.Add(new ExampleClass { Name = "Item 5" });
SelectedIndex = 1;
SelectedItem = ComboBoxSource[3];
OpenMessageBox = new RelayCommand(new Action<object>(OnOpenMessageBox));
}