WPF Tooltip, is there some sort of OnHint -

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i have application displays contentcontrols on kind of desktop.

now want show tooltips on these controls. tooltip changing time time , text tooltip coming outside application. need callback when hint appears , ask outside part text display.

how can 1 that?

if use data binding tooltip can fetch new outside data bound property , updated every time tooltip shown. xaml this:

<contentcontrol tooltip="{binding myexternaldataproperty}"/>

for datacontext object set this:

public class datacontextforcontrol {   public string myexternaldataproperty   {     { return myoutsidedatareader.somedata; }   } }

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