Bug 209126 DataException throws out when set highlight condition in sub-report[0302]
Description: Set highlight condition in sub-report, when "select value..." in the highlight dialog, DataException throws out. Build version:2.3.0.v20071108-0800 Steps to reproduce: 1.Get the attached report design file, which contains a sub-report. 2.Select the inner table, and then go to "highlight" tab in the property editor view to set a highlight rule. When click "select value...", DataException throws out. Error: The expression's value can not be retrieved. An error happened in data type conversion. Can not convert the value of org.eclipse.birt.data.engine.script.DataExceptionMocker@79c17b to Integer type.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/HighlightRuleBuilder.java
for ( int i = 0; i < columnList.size( ); i++ )
		{
			ComputedColumnHandle column = (ComputedColumnHandle) columnList.get( i );
			if ( column.getName( ).equals( name ) )
			{
				return column;
			}
		}
		return null;
	}
	private Composite createApplyStyleArea( Composite parent )
	{
		Label lb = new Label( parent, SWT.NONE );
		lb.setText( Messages.getString( "HighlightRuleBuilderDialog.text.applyStyle" ) ); 
		Composite applyStyleArea = new Composite( parent, SWT.NONE );
		applyStyleArea.setLayoutData( new GridData( ) );
		GridLayout layout = new GridLayout( 1, false );
		applyStyleArea.setLayout( layout );
		stylesChooser = new Combo( applyStyleArea, SWT.READ_ONLY
				| SWT.DROP_DOWN );
		GridData gdata = new GridData( );
		gdata.widthHint = 100;
		stylesChooser.setLayoutData( gdata );
		fillStyles( stylesChooser );
		stylesChooser.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				updateButtons( );
				updatePreview( );
			}