Currently it happens by design and unfortunately we need to admit that the component needs to be redesigned in order to correct the problem and some related ones. This planned to 4.x as no huge redesigns planned for 3.3.x branch as it is already in stabilization state.
B.t.w. the only thing that could be used in general to avoid some flickering is hideWhenScrolling attribute. But it's for scrolling only.
Thanks for info.
I thought it was something i did, now i can give up. :)