display content class xaml vb.net - wpf

Question

Well i have a mainWindow written in xaml (vb.net) with 10 buttons and for each button i have a class (with buttons...) in my project. Example: when i click on button valid i display the content of the class valid in my grid. Each class is instantiated in the class mainWdow.
I also have a grid on this mainWindow.
When i click on a button in my mainWindow, i would like to display the content of the correspondig class in my grid and of course i want to be able to use this class (click on buttons...).
What's the best way to do this on vb.net / xaml please?
On this webpage http://msdn.microsoft.com/en-us/library/cc903947(v=vs.95).aspx there are some indications but it is not what i want because i don't want just only display the content on my class but i want to be able to work with the class displayed on my grid...
I give you thanks for your advices.

Answer 1

Ok, so first you should read up about DataTemplates from the Data Templating Overview page on MSDN. Now here is the basic principal... instead of putting your reusable XAML into Windows, declare them in DataTemplates in your Window.Resources section:
<DataTemplate x:Key="StopDataTemplate">
<!--Define your content here-->
</DataTemplate>
<DataTemplate x:Key="ValidDataTemplate">
<!--Define your content here-->
</DataTemplate>
Now you can display the content of these DataTemplates in a ContentControl:
<ContentControl Name="Content" ContentTemplate="{StaticResource ValidDataTemplate}" />
Then when you want to switch to the other view, you just need to set the ContentControl.ContentTemplate property to the other DataTemplate (from Window code behind):
DataTemplate dataTemplate = (DataTemplate)FindResource("StopDataTemplate");
Content.ContentTemplate = dataTemplate;

Answer 2

Well, here is what i have done to do some tests:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<DataTemplate x:Key="CBTemplate">
<Grid Height="200" HorizontalAlignment="Left" Name="centralGrid" VerticalAlignment="Top" Width="200" Background="Red">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="300*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="1" Text="{Binding Title}"
Margin="10" HorizontalAlignment="Left" FontSize="20"/>
</Grid>
</DataTemplate>
then in my mainWindow.xaml i have this:
<Grid x:Name="layout" Background="LightBlue" Margin="250,150,260,380">
<ContentControl Name="Content" ContentTemplate="{StaticResource CBTemplate}" />
</Grid>
And in the mainWindow.vb i have:
Class MainWindow
Private t As Thing
Sub New()
InitializeComponent()
t = New Thing("test")
layout.DataContext = t
End Sub
End Class
So my program compiles properly but there is a little problem: text="{Binding Title}" doesn't work and when i replace it with "toto", there is no problem toto is displayed...
Did i miss something in my code?