I was having the same problem, but I’m not using a dataset (I’m filling the table programmatically). The solution was:
In the onChange handler of the combo box change the type of pagination of the table, something like:
$w(“#table1”).pagination = {“type”: “normal”, “rowsPerPage”: 10};
Then, when you clear the combo box to restore the full table restore the pagination type:
$w(“#table1”).pagination = {“type”: “pagination”, “rowsPerPage”: 10};