Issues with touch devices (no zooming , tooltip bug)

Hey there,

i have a problem with some touch events on a tablet with windows 8.1 (internet explorer 11) and also on a touch-monitor with windows 7 and the internet-explorer 11.

First of all the bug, i have on both devices:

The tooltips are not shown correctly. If you tap on the charts (wich is a click) it seems, that more events are fired than necessary. the tooltip shortly appear, and afterwards it disappear immediatly. So you can't read it. (Note: You can't emulate this behavior with Chrome or else)

But its the same on a Windows 8.1 Tablet and IE11

The second bug is only on the tablet ( i think it coud be some kind of MSPointerDown MSPointerUp - thing). I disabled the zooming of the page by

```

-ms-content-zooming: none;
-ms-touch-action: pan-x pan-y;
-webkit-content-zooming: none;
content-zooming: none;
```

if not, you would just zoom into the whole page, and not into the diagram. The funny thing is, on the big screen monitor with windows 7, the zoom on the diagram works fine.
On the tablet, it isn't working.