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Support Article

Scroll bar does not display on expanding tree grid in overlay



On expanding the tree grid elements in the overlay, the overlay length increases and the scroll bar does not display.

Error Messages

Not Applicable.

Steps to Reproduce

  1. Launch a modal dialog local action
  2. Add a button on the modal dialog to launch an overlay on the click event
  3. Include a tree grid in the overlay
  4. Launch the overlay and expand the tree grid elements. Scroll bar does not display

Root Cause

A defect in Pegasystems’ code or rules.

Overlay displays only static content and cannot calculate the dynamic content on load.


Perform the following local-change:

Add the below code in UserWorkForm:

max-height:500px !important;
overflow-y:auto !important;


Published October 12, 2018 - Updated October 8, 2020

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