Implemented by "custom" Controls like JUImageControl that bind
to BC4J attributes using JUDefaultControlBinding and have no default
Swing model to work with. The controls are themselves responsible
for updating the binding with their edited/updated data, so that the
binding can update the associated Attribute in a BC4J Row.
This method is invoked by the binding to add a focus listener
to the control such that JClient Panelbinding can update its status
based on control's focus.
This method is invoked by the binding to add a focus listener
to the control such that JClient Panelbinding can update its status
based on control's focus.