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
public static boolean handleValidateTargetCanContainType( Object targetObj,
			String dragObjType )
	{
		DesignElementHandle targetHandle = null;
		int slotId = 0;
		targetObj = unwrapToModel( targetObj );
		if ( targetObj instanceof DesignElementHandle )
		{
			targetHandle = (DesignElementHandle) targetObj;
			slotId = DEUtil.getDefaultSlotID( targetObj );
		}
		else if ( targetObj instanceof SlotHandle )
		{
			targetHandle = ( (SlotHandle) targetObj ).getElementHandle( );
			slotId = ( (SlotHandle) targetObj ).getSlotID( );
		}
		else
			return false;
		return targetHandle.canContain( slotId, dragObjType );
	}
	/**
	 * Returns the table or grid parent
	 * 
	 * @param handle
	 *            the child of the table or grid
	 */
	public static Object getTableParent( DesignElementHandle handle )
	{
		while ( handle != null )
		{