Toolbar calender custom ranges behavior

Hi,

When using custom ranges, old date selections is not cleared before new custom range is applied.
("alternative selection mode" is not enabled.)

So if a user first clicks on "Last month" and then "year to date",, Last month dates are deselected.

Please implement same logic for custom ranges as original selection bar.

+ Add possibility do enable "alternative selection mode" as in original selection bar for normal date selections as well.