SSRS - Graph Line Value for Parameter

For the purpose of reporting database growth, I am created everything except one and most important thing. In SSDT I'm created report, which contains graph line which need to be show in depend of parameters. I have drop-down list of databases, graph where are in sections: VALUES (Fields!dataSize.Value), Category Groups(date), Series Groups (databaseName). I have parameter databases_id (dataset1, value field: id, label field: databaseName). When I start report and select some database and click on VIEW REPORT, I get lines for every parameters(databases) on list. How to get only lines for selected parameters(databases)?