SSRS 2008 Tablix control Repeat Column Headers does not work

If you faced the issue which I have faced, that you created your nice looking report, and next thing you realise the Column headers do not repeat, no matter what you did was not good enough to fix it.

Here is the solution:

Select the Tablix that you want to repeat column headers for by clicking on it.

At the bottom of the screen, find the "Row Groups" and "Column Groups" section.

Click the small drop-down-arrow on the right side of that section, and select the Advanced Mode.

Now you'll see additional lines called (static) in rows and columns groups.

In the "Row Groups" section, locate the top-outermost "static" row and click on it.

In the properties pane, you need to set the following properties:

KeepTogether = True
KeepWithGroup = After
RepeatOnNewPage = True

All of these properties must be set for this to work properly.

Good luck!