Adding tooltips on layouts
You can add tooltips to layout objects. Tooltips appear as small yellow boxes when a user moves the pointer over an object in Browse or Find modes. Tooltips can be static text or the results of a calculation.
To add, change, or delete tooltips:
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Choose Format menu > Set Tooltip.
Tip  You can also right-click the object and choose Set Tooltip.
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Create a tooltip that displays the results of a calculation
Click Specify.
Tip  In Layout mode, choose View menu > Show > Tooltips to identify objects with tooltips. Objects with tooltips display an icon Tooltip icon in Layout mode.
Notes
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Tooltips display in FileMaker Pro, FileMaker Pro Advanced, runtime database solutions, and databases published to the web with Instant Web Publishing.
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You can select multiple layout objects to assign the same tooltip to each. When you select multiple objects, the Set Tooltip dialog box displays the tooltip for the top object.
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If the object’s tooltip calculation returns an empty string, no tooltip displays. For example, if your tooltip displays related data and the relationship is missing, the tooltip will be empty. If an error occurs in the calculation, the tooltip displays invalid or partially valid results with question marks.
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Tooltips will only work in a web viewer if Allow interaction with web viewer content is disabled, or if the web viewer is formatted as a button.
Related topics 
Creating and managing layouts
Viewing records as a form, list, or table