Integrate tooltips with CHM help in Windows app

Question

We're trying to redesign our documentation process for a Windows desktop application, and two of the requirements we have are

• Provide 'reference' help in a CHM format
• Provide tooltip help on individual controls

Currently our tooltips are hard-coded into the Delphi/C++Builder forms, but I'd ideally like to avoid the duplication, and have the CHM file as the 'master'

How can we display the Help information in the CHM file as tooltips when the user positions the mouse over certain controls?