Printing from DHTMLX Windows

How does one print the content in DHTMLX Windows?

In Chrome, I tried right click and print, it does not print the windows content.
In FF, I can do right click, select “this frame” and then “print”. It seems to work.
In Safari, I can do right click and “print frame”

Any way to provide print to users for the html page shown in DHTMLX windows in Chrome? Any better ways in FF.

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