Hi Christian Surieux,
You cannot have two RadToolTipManagers with the same ShowEvent tooltipify the same elements. I would recommend that you use the ToolTipZoneID property
for the first RadToolTipManager, instead of making it a global one.
In case this does not work, please prepare and send us a simple running project, demonstrating the problem and we will do our best to help you get the desired result.
the Telerik team
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