This ought to be simple to do (WPF ToolTip problem)

I have this Image control on a WPF form, displaying a bitmap displaying some
run-time generated stuff that the user can interact with.

Now I want to display a ToolTip when the mouse hovers over the Image
control, and move and update the contents of the ToolTip from within the
Image control's MouseMove handler as the user moves over things she can
interact with.

I can update the content of the hint just fine, but try as I may (using any
old set of ToolTipService properties), I can't seem...

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