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During the working on the issue there were created several implementations of this functionality.

1) The first implementation was created with the standard OpenLaszlo <slider> class. The problem was that this class provides only horizontal sliders. So, the UI was not beautiful:

2) The second implementation used external slider class <vslider> which is embedded into OpenMeetings code. The simple reusing of code parts from other OpenMeetings features did not lead to a very beautiful design too. But anyway, it was better then the first one:

This slider is very big. It is not compatible with other design.

3) And we realized that it is much better to make this functionality with a small design. The slider could be small and without any excess things. Also, the button icon could be smaller too and could be implemented with the good metaphor.

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