// Get tabs of the Parameters dialog box
var items = parametersDialog._ViewItems;for(var i = 0; i < items.length; i++) {
    var item = items[i];
    switch(item.getTypeName()) {
        case "PP.Exp.Ui.ParametersDataSource":
        // Handle the ControlChanged event for the Data Sources Parameters tab
        item.ControlChanged.add( function() { 
            // Refresh all contents of the tab
            item.refreshAll();
        });
        break;
        case "ParametersDimensionsView":
        // Handle the ControlChanged event for the Dimensions tab
        item.ControlChanged.add( function() { 
            // Refresh all contents of the tab
            item.refreshAll();
        });     
        break;
    }
}