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.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
*            the number of columns in the grid
	 * @param makeColumnsEqualWidth
	 *            whether or not the columns will have equal width
	 * 
	 * @return the layout created
	 */
	public static GridLayout createGridLayoutWithoutMargin( int numsColumn,
			boolean makeColumnsEqualWidth )
	{
		GridLayout layout = new GridLayout( numsColumn, makeColumnsEqualWidth );
		layout.marginHeight = layout.marginWidth = 0;
		return layout;
	}
	/**
	 * Convert the give string to GUI style, which cannot be null
	 * 
	 * @param string
	 *            the string to convert
	 * @return the string, or an empty string for null
	 */
	public static String convertToGUIString( String string )
	{
		if ( string == null )
		{
			string = ""; 
		}
		return string;
	}
	/**
	 * Convert the give string to Model style