The valid values for the style are:

• mbOK
• mbOKCANCEL
• mbABORTRETRYIGNORE
• mbYESNOCANCEL
• mbRETRYCANCEL
• mbICONHAND
• mbICONQUESTION
• mbICONEXCLAMATION
• mbICONASTERISK
• mbDEFBUTTON1
• mbDEFBUTTON2
• mbDEFBUTTON3
• mbDEFBUTTON4

The MessageBox function return value corresponds to the button which the user pressed:

• mrOK
• mrCANCEL
• mrABORT
• mrRETRY
• mrIGNORE
• mrYES
• mrNO
• mrCLOSE
• mrHELP

Example

if (MessageBox("Do you want to cancel the build", "Cancel Build", mbOKCANCEL) === mrOK){
   // build needs to stop
}