As the title says, I want to set radiation effect for my panorama title, or panorama item title. (An example would be music+video app in windows phone 7) How can I do this? The set of foreground only let me choose solid brush color.
Consider learning how to use Expression Blend, as it's much easier for such problems.
But regardless of that, any brush can be created on-the-fly, if you do a verbose-binding in XAML. You can read more on MSDN
<TextBlock Text="Hello World">
<TextBlock.Foreground>
<RadialGradientBrush GradientOrigin="0.75,0.25">
<GradientStop Color="Yellow" Offset="0.0" />
<GradientStop Color="Orange" Offset="0.5" />
<GradientStop Color="Red" Offset="1.0" />
</RadialGradientBrush>
</TextBlock.Foreground>
</TextBlock>