diff --git a/actor.py b/actor.py
index 82c16f0..2d197f6 100644
--- a/actor.py
+++ b/actor.py
@@ -60,6 +60,16 @@ class Actor:
         self.src, plt, self.cache, self._update = decide_src_plt_cache_update(pvname)
         self.plt = Frame(plt)
 
+        self.plt.cfg_ti_cache_size.value = str(self.cache.size)
+        self.plt.cfg_ti_cache_size.on_change("value", self.do_update_cache_size)
+
+
+    def do_update_cache_size(self, attr, old, new):
+        print(f"CB Update cache size: attribute \"{attr}\" changed from \"{old}\" to \"{new}\"")
+        self.cache.set_size(int(new))
+        self.plt.cfg_ti_cache_size.value = str(self.cache.size)
+
+
     def update(self):
         self._update(self.plt, self.cache)
 
diff --git a/frame.py b/frame.py
index be2578a..fc229ba 100644
--- a/frame.py
+++ b/frame.py
@@ -1,5 +1,5 @@
 from bokeh.layouts import column, row
-from bokeh.models import Button, Div, Spacer
+from bokeh.models import Button, Div, Spacer, TextInput
 
 
 CROSS = "🗙"
@@ -28,11 +28,8 @@ class Frame:
         self.cfg_dialog = cfg_dialog = column()
         cfg_dialog.visible = False
 
-        #TODO: the following is just a dummy
-        types = ("light", "default", "primary", "success", "warning", "danger")
-        for t in types:
-            btn = Button(label=t, button_type=t, height=35) #TODO: why does this need height to be set? (otherwise buttons are only properly sized on NEXT click!)
-            cfg_dialog.children.append(btn)
+        self.cfg_ti_cache_size = cfg_ti_cache_size = TextInput(value="", title="Cache size:")
+        cfg_dialog.children.append(cfg_ti_cache_size)
 
         self.btn_cfg.on_click(self.do_click_cfg)
 
@@ -49,6 +46,7 @@ class Frame:
         self.btn_close.on_click(*args, **kwargs)
 
     def do_click_cfg(self):
+        toggle_button_state(self.btn_close) # do not close plot from cfg dialog
         toggle_button_type(self.btn_cfg, "default", "warning")
         self.inner.visible = False
         switch_visibility(self.plt.fig, self.cfg_dialog)
@@ -56,6 +54,9 @@ class Frame:
 
 
 
+def toggle_button_state(btn):
+    btn.disabled = not btn.disabled
+
 def toggle_button_type(btn, type1, type2):
     btn.button_type = type2 if btn.button_type == type1 else type1