Possible Bug When Binding Data to ContentPresenter ToolTip Attribute

Question

Hello everyone,
I'm developing a small application using WPF. I have a custom ListBox control which contains a number of CheckBox entries paired up with a ContentPresenter object which displays some text obtained from a custom generic object.
If I bind the ContentPresenter 'Content' node to one of the properties of my class, it will display the text I want correctly. However, I cannot do the same with its 'ToolTip' attribute.
Here's an excerpt of my XAML.
<Window.Resources>
<local:SandboxProfiles x:Key="profiles"/>
<DataTemplate x:Key="ListBoxItemTemplate">
<!-- The ToolTip attribute doesn't accept dynamic data bindings (maybe a bug?) within the ContentPresenter node.
Therefore, the attribute has to be inserted in the parent node (WrapPanel) for it to work. -->
<WrapPanel ToolTip="{Binding Element.FriendlyDescription}">
<CheckBox IsChecked="{Binding IsSelected}" VerticalAlignment="Center" />
<ContentPresenter Content="{Binding Element.TypeString, Mode=OneTime}" Margin="2,0" />
</WrapPanel>
</DataTemplate>
</Window.Resources>
This line works absolutely fine like this,
<ContentPresenter Content="{Binding Element.TypeString, Mode=OneTime}" Margin="2,0" />
However, this doesn't work
<ContentPresenter Content="{Binding Element.TypeString, Mode=OneTime}" ToolTip={Binding Element.TypeString} Margin="2,0" />
Note I'm using the exact same pattern here, only that I'm applying it to the ToolTip attribute instead of Content. This doesn't work. It compiles, no exceptions, but no tooltip is displayed.
However, if I bind the ToolTip attribute of the CheckBox node or the parent WrapPanel node in the exact same way, it
does work. This works,
<WrapPanel ToolTip="{Binding Element.TypeString}">
And this works too,
<CheckBox IsChecked="{Binding IsSelected}" ToolTip="{Binding Element.TypeString}" VerticalAlignment="Center" />
I've searched the documentation and nowhere does it say I should expect ContentPresenter's 'ToolTip' attribute to behave differently than with any other XAML component.
This has led me to believe this is a bug in the WPF runtime. If, on the other hand, I'm missing something here, please, do let me know.
Thank you.

Answer 1

Your problem is because you're putting  a tooltip on a contentpresenter - which isn't going to respond to mouse over unless you get your mouse over it just so.
You can easily reproduce that if you throw a little markup in a new mainwindow:
<Grid Name="myGrid">
<ContentPresenter ToolTip="Banana"/>
</Grid>
Substitute TextBlock for contentpresenter
<TextBlock Text="Whatever" ToolTip="Banana"/>
And it works easily.
<TextBlock Text="{Binding Element.TypeString, Mode=OneTime}" Margin="2,0" />
Maybe I'm missing something but I can't really see why you have a contentpresenter at all.
Assuming typestring is a string as it's name rather implies.
Hope that helps.
Recent Technet articles:
Property List Editing ;  
Dynamic XAML
Substituting the ContentPresenter node for a simple TextBlock as you said worked for me, thank you.
But Magnus is right in that you do have mouse-over events with ContentPresenter components; only that for some reason I don't know, they only work when the ToolTip attribute is set to a hardcoded string and no bindings are happening. So it does respond to
the mouse but it doesn't display anything that has been dynamically bound to it, for some reason.