First pass at modal dialog

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

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+using System;
+namespace Aurora.Design.Views.Party.NewPartyDialog
+{
+    public enum ConnectionType
+    {
+        Host,
+        Join
+    }
+
+    public class ConnectionDetails : DialogReturnType
+    {
+        public ConnectionDetails()
+        {
+        }
+
+        public string HostName { get; set; }
+        public ConnectionType ConnectionType { get; set; }
+
+    }
+}

Aurora/Design/Views/Party/NewPartyDialog/NewPartyDialog.css

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+#Container {
+    background-color: red;
+}
+
+Button {
+    background-color: red;
+}

Aurora/Design/Views/Party/NewPartyDialog/NewPartyDialog.xaml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ContentView
+     xmlns="http://xamarin.com/schemas/2014/forms"
+     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+     x:Class="Aurora.Design.Views.Party.NewPartyDialog.NewPartyDialog">
+    <ContentView.Resources>
+        <StyleSheet
+             Source="NewPartyDialog.css"/>
+    </ContentView.Resources>
+    <ContentView.Content>
+        <StackLayout
+             x:Name="Container"
+             BackgroundColor="blue"
+             HorizontalOptions="Center"
+             VerticalOptions="Start">
+            <Label
+                 Text="Hostname"
+                 VerticalOptions="Center"/>
+            <Entry
+                 Text="{Binding Hostname}"
+                 x:Name="HostnameEntry"/>
+            <StackLayout
+                 Orientation="Horizontal"
+                 HorizontalOptions="Center">
+                <Button
+                     HorizontalOptions="Center"
+                     x:Name="buttonHost"
+                     Text="Host"
+                     Command="{Binding HostCommand}"/>
+                <Button
+                     HorizontalOptions="Center"
+                     x:Name="buttonClient"
+                     Text="Join"
+                     Command="{Binding JoinCommand}"/>
+            </StackLayout>
+        </StackLayout>
+    </ContentView.Content>
+</ContentView>

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

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+using System;
+using System.Collections.Generic;
+using Xamarin.Forms;
+
+namespace Aurora.Design.Views.Party.NewPartyDialog
+{
+    public partial class NewPartyDialog : ContentView
+    {
+        public NewPartyDialog()
+        {
+            InitializeComponent();
+        }
+    }
+}

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

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+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);
+        }
+    }
+}