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/ui/dialogs/HighlightRuleBuilder.java
Composite contents = new Composite( parent, SWT.NONE );
		contents.setLayout( new GridLayout( ) );
		contents.setLayoutData( new GridData( GridData.FILL_BOTH ) );
		createTitleArea( contents );
		Composite composite = new Composite( contents, SWT.NONE );
		glayout = new GridLayout( );
		glayout.marginHeight = 0;
		glayout.marginWidth = 0;
		glayout.verticalSpacing = 0;
		composite.setLayout( glayout );
		composite.setLayoutData( new GridData( GridData.FILL_BOTH ) );
		applyDialogFont( composite );
		initializeDialogUnits( composite );
		Composite innerParent = (Composite) createDialogArea( composite );
		createButtonBar( composite );
		Label lb = new Label( innerParent, SWT.NONE );
		lb.setText( Messages.getString( "HighlightRuleBuilderDialog.text.Condition" ) ); 
		Composite condition = new Composite( innerParent, SWT.NONE );
		condition.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		glayout = new GridLayout( 5, false );
		condition.setLayout( glayout );
		expression = new Combo( condition, SWT.NONE );
		gdata = new GridData( );
		gdata.widthHint = 100;
		expression.setLayoutData( gdata );
		fillExpression( expression );
		expression.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				if ( expression.getText( ).equals( VALUE_OF_THIS_DATA_ITEM )