It would seem that simple keyboard shortcuts such as copy/paste (<ctrl>C / <ctrl> V) work fine on Windows, but when running on a Mac, the equivalent keyboard shortcuts do not seem to work.
We have tested Chrome, FireFox and Safari on the Mac (OS X Yosemite 10.10).
I have visited your demo page at : http://asp.syncfusion.com/demos/web/Dashboard/DiagramBuilder.aspx
and found the same behaviour as our app.
The contextual menu items for Copy/Cut/Delete/Paste work, just not the keyboard shortcuts.
Is there something I need to do to make this work?