Hello Michael.

So...after your suggestion, I nailed it :)

I open my custom UI in a pop-up dialog and I manage all the shortcuts is this way:

<script>
	var cmds = [];
	cmds[parseInt("0x31")] = "line";
	cmds[parseInt("0x32")] = "curve";
	... other commands ...

	var cmdsAlt = [];
	cmdsAlt[parseInt("0x31")] = "polyline";
	cmdsAlt[parseInt("0x32")] = "interpcurve";
	... other commands ...

	var cmdsCtrl = [];
	cmdsCtrl[parseInt("0x35")] = "circletangent";
	cmdsCtrl[parseInt("0x36")] = "arccontinue";
	... other commands ...

	var cmdsShift = [];
	cmdsShift[parseInt("0x32")] = "sketchcurve";
	cmdsShift[parseInt("0x33")] = "rect3pts";
	... other commands ...

	function OnKeyDownEvent(e) {
		e.handled = true;

		var cmdName = null;

		if (e.shift) {
			cmdName = cmdsShift[e.keyCode];
		} else if (e.ctrl) {
			cmdName = cmdsCtrl[e.keyCode];
		} else if (e.alt) {
			cmdName = cmdsAlt[e.keyCode];
		} else {
			cmdName = cmds[e.keyCode];
		}

		if (!cmdName) {
			return;
		}
		
		moi.command.execCommand(cmdName);

		moiWindow.close();
	}
</script>

Then I also use a "fake" class to attach the "moiWindow.close();" command to all the moi:CommandButton that I use in the dialog:

<moi:CommandButton class="myCmd" ...

<script type="text/javascript">
	var buttons = document.querySelectorAll(".myCmd");

	for (var i = 0; i < buttons.length; i++) {
	   buttons[i].addEventListener("click", function (event) {
	       moiWindow.close();
	   });
	}
</script>

I hope you will ad soon the capability of trapping key event also in pop-up menu.

Thanks and have a nice day.