[Development] how to enable magnifier when adjust selections in TextArea?

[张文生]

Hi:
   I have a problem can not been sloved by myself,I use meego component's TextArea in my project,
the Magnifier can be activiated when placeandhold some time,but in some other applications like Calendar and facebookqml,i found
the magnifier can be opened when adjust selection,how?
    Any help is appreciated. Thanks
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