The control string is useless.The control is set to be Textbox with Interactive Layer Selector button.
You can set the default data in Data field of the X-Function Bulider.
| Variable Data | Input | Output | Input/Output |
|---|---|---|---|
| <active> | The default value will be set to the active GraphLayer. | useless | The default value will be set to the active range value and usless on output. |
| <new> | useless | The result value will be put into new GraphLayer. | It's useless as input, and the result value will be put into new GraphLayer. |
| <input> | It will use the input GraphLayer as input. | The result Graph will be put into the input GraphLayer. | It will use the input GraphLayer as input, the result Graph will be put into the input GraphLayer. |
You can see the more detailes in Option Strings