Reporting Services - Reading the report name by expression, which has been selected in Action

I have a RDL report and on one of the Textboxes in the Tablix I have a reference to another report in the current project.

I want to display in a tool tip the selected report name, which has been selected (from the list of existing reports in the current project) in Actions.

Is this possible?

Edit: I tried 开发者_JAVA技巧using built in code expression, I couldn't figure out the correct way to write the code though (no intelisense support). This is the approach I tried:

ReportItems("TextBox6").GetType()

Thank you in advance,

Eddie