Sorry very much because i have some problem with my work and can't reply you soon than.
With my problem if you set currentrow= null while you typing for filter may be this.Text will be set is empty at this time.
And my idea is set CurrentRow.isSelected = false; And i can't reset isSelected value at another event. I believe i can control this.
But current cell appear a orrange line in its border. You have any idea can help for me?
(Can see my image in attach file)
MyMultiColumnComboBoxElement : RadMultiColumnComboBoxElement