Im not shure either.
I programmed it so that when the textbox was filled in and a button was pressed, the textbox was set to be disabled.
And the game would start.
It did disable and the textbox did not recieve any more text.
But after that the keyboard was ignored completely.
I cant really tell u more than that.
For my usage at this point it doesnt really matter anymore, because i programmed a different way of inputting the amount of laps.
If however in the future i might stumble uppon the solution to this, i'l share it with u.
Thanx for the time to be of assistance everyone.