Call custom control variables when creating the widgets

- This better matches how they are normally created

IPython/frontend/qt/console/console_widget.py

@@ -997,7 +997,7 b' class ConsoleWidget(LoggingConfigurable, QtGui.QWidget):'
         """
         # Create the underlying control.
         if self.custom_control:
-            control = self.custom_control
+            control = self.custom_control()
         elif self.kind == 'plain':
             control = QtGui.QPlainTextEdit()
         elif self.kind == 'rich':
@@ -1036,7 +1036,7 b' class ConsoleWidget(LoggingConfigurable, QtGui.QWidget):'
         """ Creates and connects the underlying paging widget.
         """
         if self.custom_page_control:
-            control = self.custom_page_control
+            control = self.custom_page_control()
         elif self.kind == 'plain':
             control = QtGui.QPlainTextEdit()
         elif self.kind == 'rich':