author: IUnContainer is the common interface to all container classes of JmcFrame.author:
Adds a widget to the container.
Tests if a widget is inserted in the container.
Gets a widget from the container.
Removes a widget from the container.
Parameters: xName - name of the widget within this containerParameters: xObj - widget
true if the widget was found, otherwise false
Parameters: xObj - widget to test
widget
Parameters: xName - name of the widget to get within the container
the removed widget or null if there was no widget of this name inthe container
Parameters: xName - name of the widget which will be removed from the container
the removed widget or null if the widget was not inserted in thecontainer
Parameters: xObj - widget which will be removed from the container