Tip:
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Start by creating an image node.
Add a gaussian blur node, which is a group node.
Connect them.
The radius property is only a proxy.
It really controls two properties inside the node.
Control and Double click to enter the node.
These properties are controlled by the
external radius property.
Double click on the background to leave.
Choose "Group Controls" from the developer tab.
Remove the current radius property.
Choose add and enter a name for the new property.
Then select the properties this property controls.