comparing your settings with the sample report located in Telerik Reporting installation folder (default path is C:\Program Files (x86)\Telerik\Reporting Q3 2014\Report Designer\Examples\ProductSales.trdx
Check if the report item that you use for the toggle visibility action is in a containing scope that controls the item that you want to show or hide. Example: to hide a row group, the report item must be in a row group associated with the parent group or higher in the containment hierarchy.
More detailed information can be found in Drilldown Report Action
If you need further help, please attach a sample runnable project containing report definition and test data in a support ticket.
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