diff --git a/grum/mainwin.py b/grum/mainwin.py
index 24895c4..6d51f55 100644
--- a/grum/mainwin.py
+++ b/grum/mainwin.py
@@ -2,7 +2,7 @@ from PyQt5.QtCore import Qt, pyqtSignal
 from PyQt5.QtWidgets import QMainWindow, QSplitter
 
 from . import assets
-from .descs import DESC_TYPES, PlotDescription, ImageDescription
+from .descs import DESC_TYPES, Description, PlotDescription, ImageDescription
 from .dictlist import DictList
 from .exampledata import exampledata
 from .h5filedlg import open_h5_files_dialog, save_h5_file_dialog
@@ -22,8 +22,8 @@ DESC_TYPE_TO_MDI_SUB_TYPE = {
 
 class MainWindow(QMainWindow):
 
-    sig_make_new_plot  = pyqtSignal(str, PlotDescription)
-    sig_make_new_image = pyqtSignal(str, ImageDescription)
+    sig_make_new_plot  = pyqtSignal(str, Description)
+    sig_make_new_image = pyqtSignal(str, Description)
 
     def __init__(self, *args, title="grum", host="localhost", port=8000, offline=False, add_examples=False, window_mode=MDIWindowMode.MULTI, **kwargs):
         super().__init__(*args, **kwargs)
@@ -166,11 +166,11 @@ class MainWindow(QMainWindow):
 
     # Signal callbacks
 
-    def on_make_new_plot(self, *args, **kwargs):
-        self.make_subwin(MDISubPlot, *args, **kwargs)
+    def on_make_new_plot(self, name, desc):
+        self.make_subwin(MDISubPlot, name, desc)
 
-    def on_make_new_image(self, *args, **kwargs):
-        self.make_subwin(MDISubImage, *args, **kwargs)
+    def on_make_new_image(self, name, desc):
+        self.make_subwin(MDISubImage, name, desc)
 
     def on_dclick_list_item(self, item):
         self.plot_single_item(item)