Removing dialog fields

In the table dialog I want to hide several fields. I've found the .remove method but when I use it any field I remove is given a default value of zero even if I've already set a default. Is there a way to hide these fields without this happening?

if ( dialogName == 'table' )
{

dialogDefinition.removeContents('advanced');

// Get a reference to the 'Table Info' tab.
var infoTab = dialogDefinition.getContents( 'info' );

var textWidth = infoTab.get('txtWidth');
textWidth['default'] = '400';

// Remove unnecessary widgets from the 'Table Info' tab.
infoTab.remove( 'txtWidth');
infoTab.remove( 'txtHeight');
infoTab.remove( 'txtSummary');
infoTab.remove( 'txtCaption');
infoTab.remove( 'cmbAlign');
infoTab.remove( 'txtBorder');
infoTab.remove( 'selHeaders');
infoTab.remove( 'txtCellSpace');
infoTab.remove( 'txtCellPad');

}