Additional custom Tooltip possible?

Is it possible to add a custom Tooltip text, i.e. for custom buttons or for buttons where custom right-click actions are defined?
I have button templates (button_2state.xml) with
<TooltipId><Variabe name="ToolTipID"/></TooltipId> and
<Tooltip><Variabe name="ToolTip"/></Tooltip> for custom Text.
When I set custom Tooltip popup with correct text string is displayed.
When Tooltip is empty, but standard TooltipId is set, I see either Hotkey popup or nothing.

Is <Tooltip> still supported at all?
Edit: I see it's used in Deere skin and working: <TooltipId> is overwritten by <Tooltip>

Example:
Sync Button
 * left-click: sync bpm > TooltipId
 * right-click: reset rate > custom Tooltip