How to increase the link size when there is a text

How to increase the link size when there is a text on it.The link text and link are getting overlapped.

Please have a look at the picture

How did you define the TextBlock that you are using on the link? Is it something like:

<TextBlock Text="{Binding Path=Data.Text}" go:LinkPanel.Index="-1" go:LinkPanel.Offset="NaN NaN" go:LinkPanel.Orientation="Upright" />
If so, then you just need to increase the spacing between the layers. If you are using TreeLayout or LayeredDigraphLayout, increase its LayerSpacing property.