Bug 122173 Can't drag and drop a data set column to report design layout editor
With 20051227's build, I can't bind a data set column to a table cell by drag & drop it from data explorer. This is a show stopper that we need to have it fixed.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
if ( handle == null )
		{
			return;
		}
		container = unwrapToModel( container );
		if ( container instanceof DesignElementHandle )
		{
			( (DesignElementHandle) container ).addElement( handle, DEUtil
					.getDefaultSlotID( container ) );
		}
		else if ( container instanceof SlotHandle )
		{
			( (SlotHandle) container ).add( handle );
		}
	}
	/**
	 * Validates target elements can contain transfer data
	 * 
	 * @param targetObj
	 *            target elements
	 * @param transferData
	 *            transfer data,single object or array are permitted
	 * @return if target elements can be dropped
	 */
	public static boolean handleValidateTargetCanContain( Object targetObj,
			Object transferData )
	{
		return handleValidateTargetCanContain( targetObj, transferData, true ) != CONTAIN_NO;
	}
	/**