The control string is useless. The control is Textbox with Interactive Selector button.
We can set the default data in Data field of the X-Function Bulider.
| Variable Data | Input | Output | Input/Output |
|---|---|---|---|
| <unassigned> | useless | User can set the report data to the splicified layer. | Just as output. |
| <new> | useless | It will create a new Layer on the acitive page and output the data to the layer. | Just as output. |
You can see the more detailes in Option Strings