checkbox grid values to a label

I am attempting to monitor a grid of checkboxes to collect any instances of checked states. If I see any of these checked states I increment a counter and put it into a label. Example:

-user has a grid of checkboxes to select.

-user selects a few boxes.

-each time a box is selected, the label for the window increments and shows the number of boxes currently selected.

-user de-selects a checkbox. Window label is开发者_如何学Go updated accordingly.