public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } [DllImport("user32.dll")] public static extern IntPtr SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); private void pnlControlBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { WindowInteropHelper helper = new WindowInteropHelper(this); SendMessage(helper.Handle, 161, 2, 0); //DragM..