bottomLimitWidget: anAbtBasicViewFor horizontally-oriented WkSplitBar widgets, this attribute indicates the bottom most widget to which it is constrained. For vertically-oriented WkSplitBar widgets, this attribute does not apply.
 
      leftLimitWidget: anAbtBasicViewFor vertically-oriented WkSplitBar widgets, this attribute indicates the left most widget to which it is constrained. For horizontally-oriented WkSplitBar widgets, this attribute does not apply.
 
      rightLimitWidget: anAbtBasicViewFor vertically-oriented WkSplitBar widgets, this attribute indicates the right most widget to which it is constrained. For horizontally-oriented WkSplitBar widgets, this attribute does not apply.
 
      topLimitWidget: anAbtBasicViewFor horizontally-oriented WkSplitBar widgets, this attribute indicates the top most widget to which it is constrained. For vertically-oriented WkSplitBar widgets, this attribute does not apply.