I am using APEX 5.1 for my applications. I recently created an Interactive Grid and added the ROW-SELECTOR to it.
now i need to use a button to excute a PLSQL code about rows data which chechbox was selected when the button was clicked .
throw the debug result,i cant get in if:APEX$ROW_SELECTOR = 'X' then at all,why?and how to get the other colunm value in this Interactive Grid

actually i am a fresh man about APEX,thank for your look this simple question...........
i have consulted this question,but not effectivity
https://stackoverflow.com/questions/9367759/apex-tabular-form-with-row-selector-how-to-set-value-of-column-in-selected-r…