Hide Matrix Gridlines SQL Server Reporting Services 2005

I am creating a report using SQL Server Reporting Services in Visual Studio 2005 (SSRS). I put the matrix in a list. The data and matrix are working fine.

However, I cannot find a way to hide the grid lines of the matrix at runtime. Also, I set the visibility of the static 1st column and 1st row to false, but when the report is executed, the space occupied by them remains empty. Is there a way to shift the cells to the left (since the first static column was set to invisible)?

Thanks in advance, TM