OnWindowClose
Triggers a script to run each time you close a window of a database file.
When the script runs
Before a window is closed or before OnLastWindowClose (if it is selected in the Script Triggers tab) is activated.
Modes in which the trigger can be used
OnWindowClose activates after FileMaker Pro exits a mode.
Result
You can use the Exit Script script step within the triggered script to return True or False.
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Originated in
FileMaker Pro 12.0
Notes
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Related topics 
Setting up script triggers
Setting script triggers for layouts
Setting script triggers for objects