missing slider event?

When I touch slider with mouse and start sliding it, EVT_SCROLL_THUMBTRACK is received, when I stop sliding it, EVT_SCROLL_THUMBRELEASE is received. It works.
But what if I click with mouse on slider? It changes its position but no event is sent!
Why? How to detect such situation?

I use wxpython 2.8.7.1 for Linux (gtk).

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