KB43570: How to pass selector values from a selector on a grid(attribute used selector) in MicroStrategy Web

In KB38841(KB38841: How to pass selector answer "All" from targeted hyperlink to a prompt child report in Strategy Web), steps for passing 'all' selector values of multiple selectors to answer prompts in a targeted report services document/report are introduced. However if the selector is on a grid, it is not possible to find the key for the selector by viewing the HTML source like mentioned in that article.
This article introduces a method to find the key for grid selectors.
PREREQUISITES
Install a network analyzer that can view HTTP request headers. For an example of a network analyzer tool, refer to KB20064: How to install and use Fiddler for MicroStrategy Web troubleshooting for steps to install Fiddler.
STEPS TO FIND THE KEY

• Run the source document in Presentation mode.
• Make a selection from the grid selector. This action should cause an HTTP request to be sent from your browser to the Strategy Web server.
• In your network analyzer tool, find the request of clicking the selector performed in step 2. In Fiddler, an example request is shown below:
  

• Inspect the request headers. In the body of the request, find the keyword ctlKey. The key immediately following this keyword is the selector control key. In Fiddler, users can use the Inspectors > WebForms > params feature to view the body of the request. An example showing a control key value of F59 is shown below:

• Follow the URL syntax in KB38841 to create the hyperlink for passing selections.

KB43570