code: @Pure
  	public boolean isRemovable() {
  		final AttributeValue val = getAttributeProvider().getAttribute(ATTR_REMOVABLE);
  		if (val != null) {
  			try {
  				return val.getBoolean();
  			} catch (AttributeException e) {
  				//
  			}
  		}
  		return true;
  	}
docs: Replies if this layer is removable from this container.
  This removal value permits to the container to be
  informed about the desired removal state from
  its component. The usage of this state by
  the container depends only of its implementation.
  
  @return <code>true</code> if this layer is removable from its container,
  otherwise <code>false</code>