Tooltip was made, but problem with its' disappearance was nor resolved.

Changing of Popup's property StaysOpen to true/false didn't make appropriate events.If I use Property IsOpen it works just for first time. All these attempts could be found in DynamoPopup class. In my opinion creation of bigger left side of popup-window is not right solution. However, I can't suggest anything better except using something like timer.
This control is highly specific to the Library, perhaps we should call it ```LibraryToolTip```? Also, let's follow [the way WPF names](http://msdn.microsoft.com/en-us/library/ms754034(v=vs.110).aspx) these as ```ToolTip``` and not ```Tooltip``` :)