New Post: Simple layout

Hi,

There is a property on LayoutAnchorable : AutoHideWidth. It is the width of the control when it will be visible. Default is at 0 pixel.
When LayoutAnchorable.AutoHideWidth is 0, we use LayoutAnchorable.AutoHideMinWidth, which has a default value of 100 pixels.
In your sample, you could do

<avalonDock:LayoutAnchorable Title="Core Registers" AutoHideWidth="525">
......
</avalonDock:LayoutAnchorable>

where 525 is the MainWindow width.