Bug 122283 [Smoke][Regression][SPM-Linux WS]Item in library can't be used when include library from library explorer
Details: Item in library can't be used when include library from library explorer Step: 1.New a library and Insert a label. 2.Open a report design 3.Open the library exploer in report and use the library 4.Drop the library label from library explorer into layout Actual results: Expection pop up. If use the library from report outline, label can drop in layout succeed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
return false;
		}
		if ( parent == element || parent.equals( element ) )
		{
			return true;
		}
		if ( provider == null )
		{
			return false;
		}
		Object[] children = provider.getChildren( parent );
		for ( int i = 0; i < children.length; i++ )
		{
			if ( containElement( children[i], provider, element ) )
			{
				return true;
			}
		}
		return false;
	}
	/**
	 * Returns the plug-in provider
	 * 
	 * @param pluginId
	 *            the identify of the plugin
	 * 
	 * @return the plug-in provider, or null if the plug-in is not found
	 */
	public static String getPluginProvider( String pluginId )
	{