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
int size = (int) CSSUtil.convertToPoint( fontSizeValue, parentSize ) + 1;
			DimensionValue dm = new DimensionValue( size, "pt" ); 
			return dm.toString( );
		}
		else if ( fontSizeValue instanceof String )
		{
			String fontSize = (String) fontSizeValue;
			if ( fontSize.equals( DesignChoiceConstants.FONT_SIZE_LARGER ) )
			{
				return getLargerFontSize( handle.getContainer( ) );
			}
			else if ( fontSize.equals( DesignChoiceConstants.FONT_SIZE_SMALLER ) )
			{
				return getSmallerFontSize( handle.getContainer( ) );
			}
			else
			{
				for ( int i = 0; i < DesignerConstants.fontSizes.length - 1; i++ )
				{
					if ( fontSize.equals( DesignerConstants.fontSizes[i][0] ) )
					{
						return DesignerConstants.fontSizes[i + 1][0];
					}
				}
				return DesignerConstants.fontSizes[DesignerConstants.fontSizes.length - 1][0];
			}
		}
		else
		{
			return DesignChoiceConstants.FONT_SIZE_MEDIUM;