LyX ⇒ Splitting Frames into Multiple Columns

[hololop]

Hi all,
I am working on a document, which uses multicolumns. I am also using several boxes (Minipage, Simple frame) as well. The problem is: everytime a box -which is near to the end of a column- doesn't fit that column, where it has to be, Lyx automatically transfers it to the next column and leaves the previous column with a huge gap. Is there any way to prevent this by splitting the frames?