TextArea cant be edited when pivot applet loses focus

When using a TextArea component and change to another browser tab (or take another action that cause the Pivot applet to lose its focus) then get back to the pivot applet browser's tab and try to edit the text inside TextArea component: text will not change, nothing happens neither the Applet Console shows any message.

This behaviour can be reproduced with Component Explorer in http://pivot.apache.org/demos/component-explorer.html