title: Make a treeview scrollable at a custom number of rows
body: <p>In this treeview, I want to store rows with a rowheight of 500 (for example). As you can see I have attached a scrollbar which allows the Treeview to be scrollable, however the Treeview is not scrollable. I believe this is due to the <strong>treeview requiring a certain amount of rows</strong> before being scrollable, despite if it is impossible to see the next row.    </p>
  
  <pre><code># Components for PatrolOverview
  POStyle=ttk.Style()
  POStyle.configure('POStyle.Treeview', rowheight=500)
  PatrolView = ttk.Treeview(PatrolOverview,style='POStyle.Treeview')
  PatrolTitleLabel = tk.Label(PatrolOverview, text="Patrol Overview", font=TitleFont, bg="white")
  PatrolTitleLabel.grid(row=1, column=1, columnspan=5)
  PatrolView["columns"] = ("image", "patrolname", "patrolleader", "patrolaleader", "score")
  PatrolView.grid(row=2, column=1)
  PatrolView.heading("patrolname", text="Patrol Name", anchor="w")
  PatrolView.column("patrolname", anchor="center", width=70)
  PatrolView.heading("patrolleader", text="Patrol Leader", anchor="w")
  PatrolView.column("patrolleader", anchor="center", width=70)
  PatrolView.heading("patrolaleader", text="Assistant Patrol Leader", anchor="w")
  PatrolView.column("patrolaleader", anchor="center", width=70)
  PatrolView.heading("score", text="Patrol Score", anchor="w")
  PatrolView.column("score", anchor="center", width=70)
  PatrolView.grid(row=2, column=1, columnspan=5)
  PatrolViewScrollbar = ttk.Scrollbar(PatrolOverview, orient="vertical", command=PatrolView.yview)
  PatrolView.configure(yscroll=PatrolViewScrollbar.set)
  PatrolViewScrollbar.grid(row=2, column=6, sticky="ns")
  </code></pre>
  
  <p>Since I am using the <code>.grid</code> method, I cannot give an accurate pixel measurement of the treeview, so here is a screen cap. 
  <a href="https://i.stack.imgur.com/rMOR4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rMOR4.png" alt="treeview"></a></p>
  
  <p>As seen in the image, the treeview only shows one row (should be three) and the scrollbar is not working.</p>