Edit Block, add image via file manager - main scrollbar appears again

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Hey Devs!

I have currently a block where I let the user open the file manager and add a image. The problem is that the main page scrollbar is visible again after choosing a file from filemanager. Is there a way to prevent this? Maybe a javascript method call after image add?

Power Slider Lite e.g. has the same issue:
http://www.concrete5.org/marketplace/addons/power-slider-lite/...

Thanks in advance!
Matthias

programmieraffe