Vista - Remove / replace the collapser on a TreeViewItem?

Is it possible to remove or replace the collapser button on a TreeViewItem?
Ideally I'd like it gone entirely, but otherwise I would style it. I know
that the presence of a collapser indicates to the user that there is data
"underneath" the node, and usually one wouldn't remove it because it breaks
UI cues to not have it, but in my application's case the user isn't supposed
to see underlying data unless running in an "advanced" mode.

If it isn't possible, can anyone suggest other ways of presenting
hierarchial data? Currently I'm using a ListBox and toggling the visiblity
of "child" items between Visible and Collapsed, but it feels like a giant
hack and isn't proving to be very scalable, performance-wise.

I think you can restyle TreeViewItem to achieve this. You can bind
collapser.Visibility with TreeViewItem.HasItems property.
BooleanToVisibilityConverter can convert the Visiblity to boolean.

<Style x:Key="{x:Type TreeViewItem}" TargetType="{x:Type TreeViewItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid>
....
<ToggleButton Visiblity="{Binding HasItems,
Converter=..., RelativeSource=....}"/>
</Grid>
</ControlTemplate TargetType="{x:Type TreeViewItem}">
</Setter.Value>
</Setter>
</Style>

Thanks
Bai Shi

"Chris Sammis" wrote:

> Is it possible to remove or replace the collapser button on a TreeViewItem?
> Ideally I'd like it gone entirely, but otherwise I would style it. I know
> that the presence of a collapser indicates to the user that there is data
> "underneath" the node, and usually one wouldn't remove it because it breaks
> UI cues to not have it, but in my application's case the user isn't supposed
> to see underlying data unless running in an "advanced" mode.
>
> If it isn't possible, can anyone suggest other ways of presenting
> hierarchial data? Currently I'm using a ListBox and toggling the visiblity
> of "child" items between Visible and Collapsed, but it feels like a giant
> hack and isn't proving to be very scalable, performance-wise.

What I have derived from Bai Shi's post is here: http://pastebin.com/586287

However, if you put that in XamlPad you can see the problem: even
explicitly setting IsExpanded to true doesn't show child elements. How can I
accomplish that?

Hi Chris, I can't find anything from http://pastebin.com/586287
Can you send me a simple repro of you codes? You can send it to
cabbagebai@ustc.edu.
I think I didn't understand you problem very clearly.

Thanks
Bai Shi

"Chris Sammis" wrote:

> What I have derived from Bai Shi's post is here: http://pastebin.com/586287
>
> However, if you put that in XamlPad you can see the problem: even
> explicitly setting IsExpanded to true doesn't show child elements. How can I
> accomplish that?