Created Issue: Cascade Dropdown with Multi-Select Child [10111]

I am using cascade Dropdown feature for Multi-Select child, everything working fine. But the think is if I remove the value from the Selected Values Box(Right Side) , the Possible Values Box(left side) is repopulating with all the values irrespective of the parent selected, By clicking on remove option the functionality is breaking.

Please help me in solving.

Thanks in Advance