How Do I Evaluate The Toggle State Of A Textbox Within An Expression?

Hi!

On a Reporting Services 2005 report, I have a table with a single group row and a single detail row (and about 5 columns). The details are set up to toggle visibility based on a textbox in the group header called "txt_Order_Number". The order line item details are set with their initial visibility set as hidden. So, when you click on the Plus sign next to the Order Number, the detail rows display below.

However, what I'd like to do is change the background color of the toggled group header row when it is toggled and the details are displayed. Here's what's going on . . .

The row with the Order header information has every textbox set in bold. That's good. It makes a subtle distinction between the order detail rows and the order header row, so when you're looking at the dollar amounts on each line item and trying to add them up in your head to see whether they correctly add up to the dollar amount in the order header row, you can at least more easily see the total amount. However, it makes the whole overall report look funny because all of the order header information is in bold. What I really want to do is change the background color of the order header row to light gray or some other subtle color and change the font to Bold when the details are toggled to visible in order to distinguish that row as the header row.

In order to do this, I think I somehow need to get to a certain element of the Reporting Services object model called "Textbox.ToggleState". If I can get to that piece of the puzzle in an expression or even in code within the report, that should tell me the state of the textbox's toggle switch and I should be able to use that information to conditionally set the color of the textbox.(or every textbox in the row probably.) Here's all I could find out about this on TechNet

http://technet.microsoft.com/en-us/library/microsoft.reportingservices.reportrendering.textbox.togglestate.aspx


I just can't figure out how to get to that piece of information in a Reporting Services expression or in the report's code block.


Any suggestions? I'd appreciate a response even if it's "You can't do that." Actually, the best response someone might be able to provide might be a link to a sample showing how to get to any of the textbox properties like that.

Thanks!
Karen