Bug 153523 OK button in parameter dialog is enabled without default value in combo-box
Description: OK button in parameter dialog is enabled without default value in combo-box Steps to reproduce: 1. New a report parameter, combo-box. 2. Click New button, input abc as value, click OK 3. Set abc as default value and close Edit Parameter dialog. 4. New a data source and dataset 5. Edit the parameter, remove abc value and import values from dataset Expected result: OK button is disabled for there is no default value. Actual result: OK button is enabled.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
}
	private boolean isStatic( )
	{
		return staticRadio.getSelection( );
	}
	private String convertToStandardFormat( String string )
	{
		if ( string != null
				&& DesignChoiceConstants.PARAM_TYPE_DATETIME.equals( getSelectedDataType( ) ) )
		{
			try
			{
				string = new DateFormatter( STANDARD_DATE_TIME_PATTERN,
						ULocale.US ).format( DataTypeUtil.toDate( string,
						ULocale.US ) );
			}
			catch ( BirtException e )
			{
			}
		}
		return string;
	}
	private String getExpression( String columnName )
	{
		for ( Iterator iter = columnList.iterator( ); iter.hasNext( ); )
		{
			ResultSetColumnHandle cachedColumn = (ResultSetColumnHandle) iter.next( );
			if ( cachedColumn.getColumnName( ).equals( columnName ) )
			{
				return DEUtil.getExpression( cachedColumn );