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
else if ( transferData instanceof IStructure )
			{
				return handleValidateTargetCanContainStructure( targetObj,
						(IStructure) transferData ) ? CONTAIN_THIS : CONTAIN_NO;
			}
			else if ( transferData instanceof EmbeddedImageHandle )
			{
				if ( targetObj instanceof ReportDesignHandle
						&& ( (EmbeddedImageHandle) transferData ).getElementHandle( )
								.getRoot( ) instanceof LibraryHandle )
					return CONTAIN_THIS;
				else if ( targetObj instanceof EmbeddedImageNode )
					return CONTAIN_THIS;
				else
					return CONTAIN_NO;
				
				
			}
			else
			{
				return CONTAIN_NO;
			}
		}
	}
	public static boolean handleValidateTargetCanContainStructure(
			Object targetObj, IStructure transferData )
	{
		if ( targetObj instanceof EmbeddedImageNode )
		{
			targetObj = ( (EmbeddedImageNode) targetObj ).getReportDesignHandle( );