Bug 167542 A parameter group isn't deleted after moving it to another parameter group through DND
Drag a parameter group and drop it to another one is a "move" operation, which cuts the source and pastes to the destination. But the source one isn't deleted in such operation while the parameters in the group are all deleted.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
{
					return ( (TableHandle) parent ).copyColumn( columnNumber );
				}
				else if ( parent instanceof GridHandle )
				{
					return ( (GridHandle) parent ).copyColumn( columnNumber );
				}
			}
			catch ( SemanticException e )
			{
				e.printStackTrace( );
			}
			return null;
		}
		if ( source instanceof DesignElementHandle )
		{
			IDesignElement copyElement = ( (DesignElementHandle) source ).copy( );
			return copyElement;
		}
		if ( source instanceof IDesignElement )
		{
			try
			{
				return ( (IDesignElement) source ).clone( );
			}
			catch ( CloneNotSupportedException e )
			{
				e.printStackTrace( );
			}
		}