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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Click Inspector Inspector button in the layout bar, then click Position.
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Create a tooltip that displays the results of a calculation
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Tip  In Layout mode, choose View menu > Show > Tooltips to identify objects with tooltips. Objects with tooltips display a badge Tooltip badge 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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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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When you copy or duplicate an object with a tooltip, FileMaker Pro applies the tooltip to the new object.
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Related topics 
Creating a layout
Viewing records as a form, list, or table