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Need to provide support to always open the popup on top or bottom of the relative element, irrespective of the collision.
Workaround Solution Sample:
https://www.syncfusion.com/downloads/support/directtrac/general/ze/DataCORE-Angular8-Sample1811177597
Note: The popup open event in the dropdown source will not work.
Once the feature is implemented please ensure to test the same in the above sample use case with scroll, with date picker component, and other few dependent components.