When using drag and drop from one component to another, if the dragged element is a parent to one or more visual objects and you accidently begin a drag action on the child component(s) (which have not been set up for drag and drop), when you let go of the mouse to end the mouse drag sequence, the thinwire framework creates a 'ghost' image of the dragged component that is attached to the cursor. When you click the mouse again, this 'ghost' image is left behind on the screen and you can not get rid of it (even moving the entire browser off screen and back on screen continues to render it). This also happens for tree items, although the effect is generated when you accidently try to drag the parent node of a leaf that was not supposed to be draged.