void initContextMenu()
{
ContextMenu = new ContextMenu();
ContextMenu.BeginInit();
ContextMenu.ItemsSource = new MenuItem[]
{
new MenuItem() { Header = "Copy", Command = new RelayCommand(this_Copy, this_CanCopy) },
new MenuItem() { Header = "Paste", Command = new RelayCommand(this_Paste, this_CanPaste) },
};
ContextMenu.EndInit();
}