Calendar component error

I'm getting a very strange behavior with Calendar component, that can be reproduced in "kitchen Sink" demo too.
My application is configured with pt_BR locale, and when I try to select some days in May, calendar automatically changes to april, and when I select 1st May 2011 I get an IndexOutOfBoundsException (see exception bellow).
In "kitchen Sink", when a Calendar configured with US or CA locale is used, everything's ok, but when another locale based in another country (no metter the language) is used, the error can be reproduced, ex:

es_US, fr_CA - ok
es_ES, fr_FR - error

java.lang.IndexOutOfBoundsException: index -1 out of bounds.
at org.apache.pivot.collections.ArrayList.verifyIndexBounds(ArrayList.java:577)
at org.apache.pivot.collections.ArrayList.get(ArrayList.java:346)
at org.apache.pivot.wtk.TablePane$Row.get(TablePane.java:263)
at org.apache.pivot.wtk.skin.terra.TerraCalendarSkin.updateSelection(TerraCalendarSkin.java:706)
at org.apache.pivot.wtk.skin.terra.TerraCalendarSkin.selectedDateChanged(TerraCalendarSkin.java:963)
at org.apache.pivot.wtk.Calendar$CalendarSelectionListenerList.selectedDateChanged(Calendar.java:90)
at org.apache.pivot.wtk.Calendar.setSelectedDate(Calendar.java:212)
at org.apache.pivot.wtk.skin.terra.TerraCalendarSkin$4.selectionChanged(TerraCalendarSkin.java:506)
at org.apache.pivot.wtk.ButtonGroup$ButtonGroupListenerList.selectionChanged(ButtonGroup.java:46)
at org.apache.pivot.wtk.ButtonGroup.setSelection(ButtonGroup.java:128)
at org.apache.pivot.wtk.Button.setState(Button.java:469)
at org.apache.pivot.wtk.Button.setSelected(Button.java:432)
at org.apache.pivot.wtk.skin.terra.TerraCalendarSkin$DateButton.press(TerraCalendarSkin.java:77)
at org.apache.pivot.wtk.skin.terra.TerraCalendarSkin$DateButtonSkin.mouseClick(TerraCalendarSkin.java:219)
at org.apache.pivot.wtk.Component$ComponentMouseButtonListenerList.mouseClick(Component.java:483)
at org.apache.pivot.wtk.Component.mouseClick(Component.java:2777)
at org.apache.pivot.wtk.Container.mouseUp(Container.java:774)
at org.apache.pivot.wtk.Container.mouseUp(Container.java:759)
at org.apache.pivot.wtk.Container.mouseUp(Container.java:759)
at org.apache.pivot.wtk.Container.mouseUp(Container.java:759)
at org.apache.pivot.wtk.Container.mouseUp(Container.java:759)
at org.apache.pivot.wtk.ApplicationContext$DisplayHost.processMouseEvent(ApplicationContext.java:914)
at java.awt.Component.processEvent(Unknown Source)
at org.apache.pivot.wtk.ApplicationContext$DisplayHost.processEvent(ApplicationContext.java:709)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)