public override bool DoCommandBySelector(NSTextView textView, ObjCRuntime.Selector commandSelector)
{
var k = KeyCode.None;
if (commandSelector.Name == "moveUp:")
{
k = KeyCode.Up;
}
else if (commandSelector.Name == "moveDown:")
{
k = KeyCode.Down;
}
else if (commandSelector.Name == "insertNewline:")
{
k = KeyCode.Enter;
}
return(viewModel.OnFormulaKeyPressed(k));
}