First I am happy to see this control.  Second, I'm pretty sure that the grid-based version (predicted for Q2.2010) will have the ColumnWidthMode=Fill behavior of the Grid.

In the mean time, my simple example, based on your demo, does not fill the hosting RadExpander side-to-side, and I cannot use relative column widths (.3*).  How can I achieve this behavior, which would make this consistent with the entire rest of my app?

My RadExpander is itself inside a Grid with a Column of Width=*.  The control is 100% of the container wide, it's just that the column headers do not spread out across the full 100% of the container, and the data is therefore often truncated.

See screen shot (attached)

Thx,
Tim

Here is the screen shot.  Why won't it let me edit the base post to add an attachment?

Hi Tim,

Currently I can only suggest to use the

ColumnWidth property of the TreeList's column, like so:

ColumnWidth = "*"

The behavior of the star is different than in the GridView - the star will only size the column in the beginning but if the given space is resized the column will not shrink or grow.

As for the last two columns I can suggest choosing a larger width (or MinWidth), something like:

ColumnWidth = "120"

You are right that the GridView version of the TreeList will inherit the GridView's features.

Regards,
Miroslav
the Telerik team

I have finally upgraded to Silverlight 4, the Q3_2010_1110 release, and after rewriting the nav portions to remove RadPage, I am left with only fixing my RadTreeListView-based views.

I am delighted with the way this control has come out - thank you very much.  Props to you guys!

Tim