Hi Jack,
You can use the Request parameters __EVENTTARGET and __EVENTARGUMENT to determine which control caused the postback in Page_Load event and apply the changes to the RadFileExplorer. However, to provide more to the point answer I will need more details regarding the specific scenario. On what command exactly you want to change the ViewPaths of the explorer?
As an alternative solution, you can use a hidden field to store the selected row index, update it with JavaScript using the RadGrid's ClientRowSelected event and set the paths to RadFileExplorer according to the value of this hidden field in Page_Load.
Greetings,
Dobromir
the Telerik team
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