//create by ctor
var svc = new WindowDialogs()
//or using IoC
var svc = IoC.Get<IWindowsDialogs>();

//show dialog and get result "key1" or "key2" ...
var result = svc.ShowAboutBox("Metro Dialogs", "0.1.2.345", "About program, bla-bla-bla...",
                                         new ActionViewModel("DefaultAction", "key1", true),
                                         new ActionViewModel("CancelAction", "key2", false, true),
                                         new ActionViewModel("CustomAction", "key3"));

svc.OpenSplashScreen("Metro.Dialogs", "0.1.2.34", "About box\nSplash screen\netc...",
                                             "Organization ltd.", "all right reserved", "licened to ");

//without filter
svc.SelectItemDialog("Caption", "Message", false,
                new SelectItem("DisplayName 1", "Description 1", 1),
                new SelectItem("DisplayName 2", "Description 2", 2);
                
//with filter items
svc.SelectItemDialog("Caption", "Message", true,
                new SelectItem("DisplayName 1", "Description 1", 1,_=>_ == "1"),
                new SelectItem("DisplayName 2", "Description 2", 2, _ => _ == "2"));