When %dockPosition% is Floating, sets the rectangle used to determine the size and position of the pane when %dockPosition% is Floating. Coordinates are relative to the upper-left-hand corner of the main Revit window. 
   Namespace:   Autodesk.Revit.UI  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Parameters
- rect
 -  Type:  Autodesk.Revit.UI Rectangle  
 
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | Rectangle is not normalized. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |