Mouse Move with Button Down causes BrowserPlugin Dragging

[SchlauKunde]

I have
- created my own SC BrowserPlugin Class by deriving from the class isc.BrowserPlugin.
- created an instance of my own SC BrowserPlugin Class
- added the instance as a child to a Canvas
- created a window in another Canvas; this window can be drag repositioned

Now when I drag reposition the window, the display of the BrowserPlugin instance disappears and the word "Dragging ..." is displayed instead; this behaviour is NOT intended.

I have added the following properties in several different places (Canvas, BrowserPlugin):
dragStartDistance: 100000,
canDragReposition: false,
canDrag: false,
canDrop: false,
canAcceptDrop: false,


But alone: The annoying "Dragging ..." behaviour of the BrowserPlugin instance remains the same ...

I my current scenario I do NOT need any Drag-And-Drop functionality at all; is there perhaps a global switch to turn off this functionality ?