Learning WPF & C# - Day one

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C#

WPF

Hi,
I have decided to start learning c# and wpf today and am sure there will be 100 more posts to follow :)
I plan to follow a few tutorials tonight on here but while I am at work I thought I would have a quick play around.
I have created a page with some buttons, each button is to spawn a new form.
The first button will always work but once i add several more I start getting errors.

Could I have an explanation as to why this is?

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Window win = new bapp();
            win.Show();
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            Window win = new Ulinks();
            win.Show();
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            Window win = new tasks();
            win.Show();
        }

        private void button4_Click(object sender, RoutedEventArgs e)
        {
            Window win = new settings();
            win.Show();
        }
    }
}

UPDATE 1

I get the following error for all other buttons

Cannot implicitly convert type 'Dehub.Ulinks' to 'System.Windows.Window' C:\Development\c#\Dehub\Dehub\MainWindow.xaml.cs 36 26 Dehub


UPDATE 2

Here is the XMAL of Ulinks

<Page x:Class="Dehub.Ulinks"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
	Title="Ulinks">

    <Grid>