ReportBuilder 3 - Block empty column width

Hi all :)

I have a little problem on my layout.

I am making a report which present a annual planning. I want to display holidays like in a real calendar (with a vertical bar on the middle of the day).

I could do it without problems : with 2 colums for a day : 
the first is white
the second is white too, but its border color change if the day is an holiday.

In the first coloumn I have text too (the text is variable.) In the second column there is no text, it's just estethic (to remember the first column).

So in my report I have taken a width for the column, but when I run it, there is a sort of default width, and it's really large. 

I would like that my column set the really width I choosen.

With my really poor english, I think a draw must be more clear ^^




I tested: when I take a "i" in it : the real width is applicated...

I don't understand ^^ Do you have an idea ?


(That is the reason why I have choosen to use 2 columns, at the begenning i had 3 columns but the same problem...)

Thank you soooo much by advance :)

See you.