The OnSourceDestChange event can be implemented by a script add-in to receive notification whenever a tab's source/destination state changes.
| Method Name: | OnSourceDestChange | 
| Argument Type: | |
| Return Type: | none | 
| Description: | The SourceDestData.tab property identifies the tab, and the source and dest properties identify the new state (if both are False it means the tab is "off" - this can only happen in a single file-display Lister). |