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
* 0xRRGGBB.
	 * 
	 * @param rgb
	 *            RGB value.
	 * @return Integer value.
	 */
	public static int getRGBInt( RGB rgb )
	{
		if ( rgb == null )
		{
			return -1;
		}
		return ( ( rgb.red & 0xff ) << 16 )
				| ( ( rgb.green & 0xff ) << 8 )
				| ( rgb.blue & 0xff );
	}
	/**
	 * Gets the list of data sets which can be used for the specified element
	 * 
	 * @param handle
	 *            the handle of the element
	 * @return Returns the list of data sets which can be used for this element
	 */
	public static List getDataSetList( DesignElementHandle handle )
	{
		List dataSetList = new ArrayList( );
		if ( handle instanceof ReportElementHandle )
		{
			if ( handle instanceof ReportItemHandle )
			{