Is there a way to refresh pgAdmin's schema browser via SQL? [on hold]

I use pgAdmin III and every time I launch a SQL query, the database structure doesn’t refresh automatically. For instance: dropping a table doesn’t make the table disappearing from the database tree on the left of the GUI. I have to click the schema where the table was and click the ‘refresh’ button. My question: is there a SQL command I could write after my DROP TABLE... in order to do it automatically?