[SOLVED] WPF shrinking child panel

WPF shrinking child panel

I'm working on a UI for a WPF application. I have in my window Stack Panel with some Expanders inside. In each Expander are some controls, one being a List Box. What I want to do is have the List Box resize (shrink or grow) when the window is resized. At the moment, when I re-size, the expander are getting clipped off but the listbox (sometimes very long in height) remains unchanged. How do I go about making this happen.

A good example is in Outlook 2007, the "Mail Folder" on the left shrinks with window size but the other controls don't.

Thanks in advance.

Solution

I've found something interesting myself. I've extended the grid control with a simple method that fires when the expander is expanded, I would call this.

RowDefinitions[GetRow(expander)].Height = (expander != selectedExpander) ?
    new GridLength(1, GridUnitType.Auto) :
    new GridLength(1, GridUnitType.Star);

This worked very nicely.