add Recommendation

src/Shared/HandyControl_Shared/Interactivity/Commands/PushMainWindow2TopCommand.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Interop;
+using HandyControl.Tools.Interop;
+
+namespace HandyControl.Interactivity
+{
+    public class PushMainWindow2TopCommand : ICommand
+    {
+        public bool CanExecute(object parameter) => true;
+
+        public void Execute(object parameter)
+        {
+            if (Application.Current.MainWindow != null && Application.Current.MainWindow.Visibility != Visibility.Visible)
+            {
+                Application.Current.MainWindow.Show();
+                var hwndSource = (HwndSource)PresentationSource.FromDependencyObject(Application.Current.MainWindow);
+                if (hwndSource != null)
+                {
+                    UnsafeNativeMethods.SetForegroundWindow(hwndSource.Handle);
+                }
+            }
+        }
+
+        public event EventHandler CanExecuteChanged;
+    }
+}