ATTR_CALLBACK_DATA (Panel)
| Type: | Panel attribute |
| Description: | A pointer-width value that is passed to the panel callback function. The value can be a pointer to user data. If the callback is chained or you intend to chain the callback, use the GetChainedCallbackData and SetChainedCallbackData functions, instead of this attribute, to get or set callback data. |
| Data Type: | pointer |
| Default Value: | NULL |
| LabWindows/CVI Compatibility: |
LabWindows/CVI 3.0 and later |