The problem is the popup after mouseclick. I click on a field and want to start to write the number, I must close the num pad field per mouse. But I have an other idea, no option is needed. Why not let the user ignore the num pad UI? Click - write - TAB ... after the TAB the num pad could be automatic closed. We could call it a bug, that the TAB dosn't work, if the num pad is open. If it is manual closed, than the TAB works like expected, could be nice to get it during the open num pad too.