Dock or float a panel
You can set each panel in Microsoft Expression Blend either to float anywhere on the desktop or to be docked to a default location. The default location depends on whether you are in the Design workspace or the Animation workspace. For example, in the Animation workspace, the Interaction panel moves below the artboard, which provides more room to view the timeline.
If you are using dual monitors, you can drag a floating panel to one of the monitors to provide more workspace on the other monitor.