http://jsbin.com/sapipeyewi/1/
The feature table can only be shown correctly in the floating pane when it is first time clicked.
There are two issues I confused.
1) if close the floating pane, nothing will happen if clicking on the button "Township"
2) if hide the floating pane, the feature table is displayed beyond the size of float pane when clicking on the button "Township"
Thanks for your help~