Bug 120218 Right click menu option to apply theme.
We should support the following right click menu. -- User right clicks int he report design layout area. -- The following menu items needs to be supported Theme --> Apply Theme -->Theme1 -->Theme2 ( similar to Apply style menu option )
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
{
			defn = DesignEngine.getMetaDataDictionary( )
					.getExtension( elementName );
		}
		return defn;
	}
	/**
	 * Get display label of report element
	 * 
	 * @param obj
	 */
	public static String getDisplayLabel( Object obj )
	{
		return getDisplayLabel( obj, true );
	}
	/**
	 * Get display label of report element
	 * 
	 * @param obj
	 */
	public static String getDisplayLabel( Object obj, boolean includeElementName )
	{
		if ( obj instanceof DesignElementHandle )
		{
			DesignElementHandle handle = (DesignElementHandle) obj;
			String elementName = handle.getDefn( ).getDisplayName( );
			String displayName;
			if ( handle.getQualifiedName( ) != null
					&& !handle.getQualifiedName( ).equals( handle.getName( ) ) )
			{