How to create a Constant in SSRS 2005

From MSDN:
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Constants
Select the Constants node to define expressions that include a constant value. Constants are used to specify color, font, and enumerations.

Not all items will support expressions that can be set to a constant. If a property cannot be set to constant value, the description provides this information.
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So depending on what item you want to use an expression on it may or may not be available and you cannot create the yourself.

My question still is, how do I actually define the constant?  There doesnt seem to be a place to do it, ie in my screen shot, where do i click to make a constant? Everytime I make a text box it just says 'No constants are availible for this propoperty'

Yes thats what It stated in my previous post "Not all items will support expressions that can be set to a constant", so you cant make a constant only use those that are available.

Like in the screen clip below using it on a property where its allowed.


constants.png

Everytime I look at an expression window in our reports, I never see the color options that you have.  Can you give me an example of what object your looking at and what 'Custom' and 'Web' are?

The property I took a screenshot from was the background color of a cell in the report.
The Custom can be any color, the web are 'aproved' save colors to use for the web.

Try it on a font property and you will see a different set of constants.