I assume you have a control.


private void jprad_MouseEnter(object sender, MouseEventArgs e)
{

ToolTip sample = new ToolTip();
sample.Content = "JAPAN";
jp_rad.Content = sample; //Japan Radio Button

}

we have added our Tooltip object in MouseEnter of a radiobutton named jprad which has a value of "Japan"


by assigning Content property of any control,you can show tooltip in Silverlight dynamically.


Cheers,