Bug 146159 [Regression]Changing font operation doesn't work other than the first time
Description: The first time changing operation can work well. However, Change it again, it won't work. Steps: 1.Insert lable/text to layout or master page 2.Change the font from serif to cursive, it works well 3.Change the font again Result: The action doesn't work Additional infor: build number:200606080632
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
/**
	 * Checks if the value can be converted to a valid Integer.
	 * 
	 * @param val
	 * @return true if the value can be converted to a valid Integer, else
	 *         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 );