I have only one cell in each band of this Grid show. So the Grid looks like a Tree (see example below)

Other than the cell I display, I have other cells in one of the bands. But I want them to show ONLY when the user hovers over a row in that band. This is to keep the display simple until user gets onto that row.

So in the example below, I want the special cells SP11 and SP12 to show only when mouse is  on Row C1

while SP21 and SP22 should show only when mouse is on on Row C2. 

Band A         A1

Band B            + B1

Band C                + C1      SP11    SP12 

Band C                 + C2      SP21    SP22

What I have tried so far:

    - Hide the "SP" Columns in the InitializeLayout

    - On MouseEnterElement, unhide cell SPxx  when mouse is on that row. So, code tries to unhide SP11, SP12 when mouse is on row C1 . 

But that did not work. SPxx never shows even though I unhide. I am guessing the column Hide setting overrides the Cell setting

Need idea how to implement this. Thanks!