ROI with 'Alt' and 'shift' key

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ROI with 'Alt' and 'shift' key

vidya
Dear ImageJ,

I have a question related to drawing an ROI. Following are the steps involved.

1. Open a DICOM image by drag and drop into ImageJ .  
2. Create a rectangular ROI.
3. Use 'Shift' key and add another rectangular ROI. I see 2 rectangular ROIs now.
4. Now with 'Shift' key held, click on the image (just click and release the mouse button without drawing any area) --> The previously defined ROI disappears.  Why is this happening? I thought that they should still be visible.
5. Now again I simply draw a rectangular ROI again (without shift key), and now along with the newly created ROI, the previously defined ROI re-appears.

Is this the working behaviour of ImageJ? It is bit confusing since at step 5, the previously defined ROI's also re-appear.. The issue is same when I use 'Alt' key.  

Kindly let me know if this is considered a bug or this is the expected behaviour.

thanks,
Vidya