Defocus and expanding over borders

Hey guys,

here’s a noob question again.

I painted a window in Photoshop to use it as a patch in a composite. In my composite I need to defocus this window because it’s way in the background. When putting the defocus node on, it blurs only in the parts that are opaque from the alpha. In After Effects most blur-filters got a setting like "expand borders", so that it blurs over the actual patch-size. Is this possible in Nuke too?

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