Hi.
Maybe this helps:
1. on parent of multiline (e.g. on the form): setting "hoverHelpEnabled= true"
2. event to script: hoverHelpRequested (e.g. on form) -> setHoverHelpText: callData
3. implement setHoverHelpText: callData
setHoverHelp: callData
callData item name = 'Multi-line Edit1' ifTrue: [callData labelString: 'Hello'].
Regards
Alex