Viewing multiple tags in single panel using variable templating

I am using an api as simplejson datasource in grafana.When I am trying to see tag values in a panel by making multiple queries manally, I am able to see trends for diffrent tags in the same panel.But after mapping those tags as variable, when I am trying select multiple tags from drop down I am not getting any data in the panel.If I try repeatation of tags, then I am getting multiple panels for the tags.But I want multiple tags in a single panel using variables.