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
* Converts the String value to an RGB object value, the String format is
	 * "r,g,b", no quotation marks.
	 * 
	 * @param val
	 *            String value.
	 * @return RGB value.
	 */
	public static RGB getRGBValue( String val )
	{
		if ( val != null )
		{
			if ( val.startsWith( "#" ) ) 
			{
				int rgb = ColorUtil.parseColor( val );
				if ( rgb != -1 )
				{
					return getRGBValue( rgb );
				}
			}
			else
			{
				String[] ss = val.split( "," ); 
				if ( ss.length == 3 )
				{
					try
					{
						int r = Integer.parseInt( ss[0] );
						int g = Integer.parseInt( ss[1] );
						int b = Integer.parseInt( ss[2] );
						return new RGB( r, g, b );