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
targetObj instanceof DesignElementHandle
					|| targetObj instanceof SlotHandle )
			{
				commands.add( getNewCommand( commandType,
						transferData,
						targetObj,
						position ) );
			}
		}
		else if ( transferData instanceof IStructure )
		{
			commands.add( new PasteStructureCommand( (IStructure) transferData,
					targetObj ) );
		}
		else if ( transferData instanceof StructureHandle )
		{
			commands.add( new PasteStructureCommand( ( (StructureHandle) transferData ).getStructure( ),
					targetObj ) );
		}
	}
	/**
	 * Returns specified command
	 * 
	 * @param commandType
	 *            command type, value is <code>TYPE_CUT</code> or
	 *            <code>TYPE_COPY</code>
	 * @param transferSource
	 *            transfer source
	 * @param newContainer