different styles for treeview

Hi, I'm trying to find how to set different style for TreeView items. At the first level it should be string (Album name) and at the second - items with image + text (as photo with date). Looks simple, but I read alot of treads here and find only separate snippets which is not work when I try to put it to my code.

As I understand there should be 2 classes (root and leaf) which is connected like bellow:

Public Class ClassBase
Public Property Text() As String
Get
Return m_Text
End Get
Set(value As String)
m_Text = Value
End Set
End Property
Private m_Text As String
End Class

Public Class Class1
Inherits ClassBase
Public Property Text2() As String
Get
Return m_Text2
End Get
Set(value As String)
m_Text2 = value
End Set
End Property
Private m_Text2 As String

Public Property Image2() As Image
Get
Return m_Image2
End Get
Set(value As Image)
m_Image2 = value
End Set
End Property
Private m_Image2 As Image

End Class

After that I need some templates in Resources for the root and leaf in a tree like bellow:

<DataTemplate x:Key="TView">
<Grid d:DesignWidth="110" d:DesignHeight="38">
<Label Content="Label" HorizontalAlignment="Left" VerticalAlignment="Top"/>
</Grid>
</DataTemplate>
<DataTemplate x:Key="TView2">
<Grid d:DesignWidth="172" d:DesignHeight="60">
<Image HorizontalAlignment="Left" Height="60" VerticalAlignment="Top" Width="100"/>
<Label Content="Label" HorizontalAlignment="Right" VerticalAlignment="Top"/>
</Grid>
</DataTemplate>

And, of course TreeView itself at my Window:

<TreeView HorizontalAlignment="Left" Height="247" Margin="251,10,0,0" VerticalAlignment="Top" Width="208"/>

But after that I have no idea, how to combine it! I understand that it should be binded somehow, but not really understand how. And the second - I not really get, how to fill this kind of tree... Can someone help?

Aleksey