Interactive sorting is not working for multiple pages

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SSRS

Hi,

This is what i did:
1) choose Tablix -> textbox
2) right click the selected textbox and go to Text Box properties
3) i click on "Interactive Sorting"
I checked "enable interactive sorting on this text box"
+
Detail rows

Sorty by:
field name

When i run the report and click on icon(for interactive sorting) beside column name then it only sort on whatever page i am on.But my report
is multipage and it is not sorting for all pages.

Thanks.