How can I call a procedure in an Access form from a control on a ribbon?

On the Ribbon XML where you describe the Control you have something like

onAction="The Name of Your Method"

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Take Note that the method should have an argument like this

Public Function NameOfYourImage(ctl As IRibbonControl)
' Your Code
End Function

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If you want to see it in action i have an Article on using Images for dynamically populating Controls' PictureData and since i use Ribbon for Navigation you can get the Complete Code on how it works
My Article is : Defeating the device-independent bitmap (.dib) format

John, I think maybe I didn't explain myself well. No problems calling procedures which are in a standard module. I cannot call a procedure which is in a form's class module. Does that make more sense?

John, thank you. That is exactly what I needed.