Is there a way to manipulate the click position getter method? I tried changing the position of SelectableGroup tag to exactly correct place but it didn't help, it still calculates offset values from the left corner of document and drawing the selection using those numbers from the left corner of my div

In the above screenshot, my div is separated from the left corner of the document exactly the same amount as in their differences.
Is this a bug or am I looking in the wrong direction?