First pass at modal dialog

Aurora/Design/Views/Party/NewPartyDialog/NewPartyDialogViewModel.cs

@@ -0,0 +1,71 @@
+using System;
+using Xamarin.Forms;
+
+namespace Aurora.Design.Views.Party.NewPartyDialog
+{
+    public class NewPartyDialogViewModel : BaseDialogViewModel
+    {
+        public NewPartyDialogViewModel()
+        {
+            this.ReturnObject = new ConnectionDetails();
+            HostCommand = new Command(OnHostExecute, OnHostCanExecute);
+            JoinCommand = new Command(OnJoinExecute, OnJoinCanCanExecute);
+        }
+
+        public string Hostname
+        {
+            get
+            {
+                if (ReturnObject is ConnectionDetails)
+                {
+                    ConnectionDetails obj = ReturnObject as ConnectionDetails;
+                    return obj.HostName;
+                };
+                return string.Empty;
+            }
+            set
+            {
+                if (ReturnObject is ConnectionDetails)
+                {
+                    ConnectionDetails obj = ReturnObject as ConnectionDetails;
+                    if (value != obj.HostName)
+                    {
+                        obj.HostName = value;
+                    }
+
+                    OnPropertyChanged(Hostname);
+                    HostCommand.ChangeCanExecute();
+                    JoinCommand.ChangeCanExecute();
+                }
+            }
+        }
+
+
+        public void OnHostExecute()
+        {
+            ConnectionDetails obj = base.ReturnObject as ConnectionDetails;
+            obj.ConnectionType = ConnectionType.Host;
+            Finish();
+        }
+
+        public Command HostCommand { get; private set; }
+        public Command JoinCommand { get; private set; }
+
+        public bool OnHostCanExecute()
+        {
+            return string.IsNullOrWhiteSpace(Hostname);
+        }
+
+        public void OnJoinExecute()
+        {
+            ConnectionDetails obj = base.ReturnObject as ConnectionDetails;
+            obj.ConnectionType = ConnectionType.Join;
+            Finish();
+        }
+
+        public bool OnJoinCanCanExecute()
+        {
+            return !string.IsNullOrWhiteSpace(Hostname);
+        }
+    }
+}