C h a p t e r 5 : R e m o v i n g t h e Tr a i n i n g W h e e l s : B u i l d i n g B a s i c R e p o r t s 243 line indicates a spelling error. In the Expression dialog box, this means a problem exists with the syntax of your expression. Hovering over the red line provides you with a brief description of the problem. The Tablix and Data Regions In the report you just completed, you saw when we dragged a table from the Toolbox onto the design surface, we actually ended up with a report item called a tablix. A tablix provides the capabilities of a table and a matrix combined into one. When we selected a table from the toolbox, what we really did was select a template that creates a tablix that functions like a table. When we select a matrix from the toolbox, as we will do in our next report, we really select a template that creates a tablix that functions like a matrix. In the same manner, the list is a template that creates a tablix that functions like a freeform list. In the previous report, you saw how the tablix, when functioning like a table, starts with a predefined number of columns. It then adds a data row to the resulting report for each record in the dataset. The tablix, when functioning like a matrix, creates both rows and columns based on the contents of the dataset. You see this demonstrated in our next report. The tablix, when functioning like a freeform list, is not limited to rows and