Elevation of selection controls differs between components

We have noticed inconsistent "elevations" being used for
* the drop-down list for a multi-select control has a drop-shadow of about 3 px
* the dialog for a calendar control for a date selector has a drop-shadow about twice the size
* the dialog that hosts the filter controls for a Data Grid column is about 10 times greater.

See attached image

This creates a confusing end-user experience

Attachment: syncfusiondropshadows_bc8489e0.zip

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