I haven't had much luck with altering the size of JCheckboxes in Vision. if you want to select all of the alarms in an alarm status table using a button, this code will do it:
checkBoxTable = event.source.parent.getComponent('Alarm Status Table').getComponent(0).getComponent(0).getComponent(1).getComponent(0).getComponent(3).getComponent(0)#this is the table that contains the selection checkboxes
for row in range(checkBoxTable.getRowCount()):#loops through and selects all checkboxes
checkBoxTable.setValueAt(True, row, 0)
If you need to acknowledge the alarms via a script, then you will need to use this:
system.alarm.acknowledge