Since you didn't post any code I can only guess what the problem is....here's what I'm doing and it works fine in Beta2:
public class MyActionList : DesignerActionList
{
private MyDesigner _owner;
public MyActionList(MyDesigner owner) : base(owner.Component)
{
_owner = owner;
}
}
Note the call to 'base(owner.Component)'
Hope that helps! If not, post some code and I'll take a look at it.