Tooltip bind to Textblock inside image tag not getting called every Mouse Over

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WPF

C#3.5

hi,

I want to display tooltip on image. i am using MultiConverter for the same.
But Converter gets called only on Page load.
My requirement is i want to call converter every times when i do mouse over on image.

<Image.ToolTip>
<tooltip hasdropshadow="True">
<border horizontalalignment="Stretch">
BorderThickness="0,0,0,1">
<textblock fontfamily="Consolas" textwrapping="WrapWithOverflow" width="600">
<textblock.text>
<multibinding converter="{StaticResource toolTipConverter}">
<binding path="Culture">





</Image.ToolTip>