Vista - XAML property corresponding to Autosize in Windows Forms

I have an animated leftside navigation panel that can collapse.

I want the right side 'data panel' to automatically expand and
follow the animation of the left side panel.

I have a variety of controls (in different utilities, apps, etc) in the
'data panel' and am looking for an 'Autosize' property (like in Windows
Forms) in XAML.

I have done some testing and the XAML controls do not seem to be 'following'
the
animation (as a default render behaviour).

Is there a 'XAML' based property that I can set to cause 'follow the
animation'
behavior?

The desired result is that data panel elements will automatically expand and
follow the Storyboard based animation expand/collapse sizing.

Thanks much in advance.

Shawnk (a XAML newbie :-)

PS. There are a lot of newbie XAML coders looking for this on the Internet.

After a lot of experimentation I found out most default behaviour will
autosize using

<.... Width = "Auto" ..>

or on some parent elements

<.... HorizontalAlignment = "Stretch" ...>

However the Stackpanel and Dockpanel behave differently (as containers).
The Dockpanel seems to expand and collapse in situations where the stackpanel
(in the exact same situation) will not automatically expand/contract.

Shawnk

"Shawnk" wrote:

> I have an animated leftside navigation panel that can collapse.
>
> I want the right side 'data panel' to automatically expand and
> follow the animation of the left side panel.
>
> I have a variety of controls (in different utilities, apps, etc) in the
> 'data panel' and am looking for an 'Autosize' property (like in Windows
> Forms) in XAML.
>
> I have done some testing and the XAML controls do not seem to be 'following'
> the
> animation (as a default render behaviour).
>
> Is there a 'XAML' based property that I can set to cause 'follow the
> animation'
> behavior?
>
> The desired result is that data panel elements will automatically expand and
> follow the Storyboard based animation expand/collapse sizing.
>
> Thanks much in advance.
>
> Shawnk (a XAML newbie :-)
>
> PS. There are a lot of newbie XAML coders looking for this on the Internet.