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var activeSheet = spread.getActiveSheet();
spread.commandManager().register('myCmd',function ColorAction() {
	//Click on a cell and press the Enter key.
    activeSheet.getCell(activeSheet.getActiveRowIndex(), activeSheet.getActiveColumnIndex()).backColor("red");
}); 
//Map the created action to the Enter key.
spread.commandManager().setShortcutKey('myCmd', GC.Spread.Commands.Key.enter, false, false, false, false);