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The tooltip is not taking place in the fixed position. the cause of the issue is that the hover element is not updated properly. in some case move mouse pointer to the tooltip object in the swimlane, the hover element is set as the object which takes place under the mouse, but the while moving the mouse pointer form that object t to swimlane the hover element is not changed so the tooltip is not disappeared and take place in the wrong place
please find the code at following sample link and change the constraints as following
(NodeConstraints.Default &~NodeConstraints.InheritTooltip) | NodeConstraints.Tooltip