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
*         false.
	 */
	public static boolean isValidInteger( String val )
	{
		try
		{
			Integer.parseInt( val );
		}
		catch ( Exception e )
		{
			return false;
		}
		return true;
	}
	/**
	 * Checks if the value is a valid number, including any integer and float,
	 * double.
	 * 
	 * @param val
	 */
	public static boolean isValidNumber( String val )
	{
		try
		{
			Double.parseDouble( val );
		}
		catch ( Exception e )
		{
			return false;
		}