diff --git a/wx/lib/mixins/listctrl.py b/wx/lib/mixins/listctrl.py
index 021eca8d..c0c72532 100644
--- a/wx/lib/mixins/listctrl.py
+++ b/wx/lib/mixins/listctrl.py
@@ -611,14 +611,15 @@ class TextEditMixin:
 
         y0 = self.GetItemRect(row)[1]
 
-        editor = self.editor
-        editor.SetSize(x0-scrolloffset,y0, x1,-1)
+        def _activate_editor(editor):
+            editor.SetSize(x0-scrolloffset,y0, x1,-1, wx.SIZE_USE_EXISTING)
+            editor.SetValue(self.GetItem(row, col).GetText())
+            editor.Show()
+            editor.Raise()
+            editor.SetSelection(-1,-1)
+            editor.SetFocus()
 
-        editor.SetValue(self.GetItem(row, col).GetText())
-        editor.Show()
-        editor.Raise()
-        editor.SetSelection(-1,-1)
-        editor.SetFocus()
+        wx.CallAfter(_activate_editor, self.editor)
 
         self.curRow = row
         self.curCol = col