Am sorry for late reply , thanks that worked , i passed file and duplicate frame to send geometric bounds and then assinged same geometric bounds to group which fixed my problem .
public function PlaceSnippetInFrame(file:File,_frame:Object):void{
try{
myDocument.pages.item(0).place(file);
var myGroupObject:com.adobe.indesign.Group=myDocument.groups.item(0);
myGroupObject.geometricBounds =_frame.geometricBounds;
_frame.remove();
}catch(e:Error){
trace("Error:"+e.toString());
myLogger.error(e.message);
}
}