diff --git a/src/app/script/dialog_class.cpp b/src/app/script/dialog_class.cpp
index 14c86e62a..e3b555445 100644
--- a/src/app/script/dialog_class.cpp
+++ b/src/app/script/dialog_class.cpp
@@ -143,13 +143,17 @@ struct Dialog {
 
   gfx::Rect getWindowBounds() const {
     gfx::Rect bounds = window.bounds();
-    // Bounds in scripts will be relative to the the main window
-    // origin/scale.
+    // Bounds in scripts will be relative to the parent window
+    // origin/scale (or main window if a parent window wasn't specified).
     if (window.ownDisplay()) {
-      const auto mainWindow = App::instance()->mainWindow();
-      const int scale = mainWindow->display()->scale();
+      const Display* parentDisplay = window.parentDisplay();
+      if (!parentDisplay) {
+        const auto mainWindow = App::instance()->mainWindow();
+        parentDisplay = mainWindow->display();
+      }
+      const int scale = parentDisplay->scale();
       const gfx::Point dialogOrigin = window.display()->nativeWindow()->contentRect().origin();
-      const gfx::Point mainOrigin = mainWindow->display()->nativeWindow()->contentRect().origin();
+      const gfx::Point mainOrigin = parentDisplay->nativeWindow()->contentRect().origin();
       bounds.setOrigin((dialogOrigin - mainOrigin) / scale);
     }
     return bounds;
@@ -159,9 +163,14 @@ struct Dialog {
     if (window.ownDisplay()) {
       window.expandWindow(rc.size());
 
-      const auto mainWindow = App::instance()->mainWindow();
-      const int scale = mainWindow->display()->scale();
-      const gfx::Point mainOrigin = mainWindow->display()->nativeWindow()->contentRect().origin();
+      const Display* parentDisplay = window.parentDisplay();
+      if (!parentDisplay) {
+        const auto mainWindow = App::instance()->mainWindow();
+        parentDisplay = mainWindow->display();
+      }
+
+      const int scale = parentDisplay->scale();
+      const gfx::Point mainOrigin = parentDisplay->nativeWindow()->contentRect().origin();
       gfx::Rect frame = window.display()->nativeWindow()->contentRect();
       frame.setOrigin(mainOrigin + rc.origin() * scale);
       window.display()->nativeWindow()->setFrame(frame);
@@ -264,6 +273,13 @@ int Dialog_new(lua_State* L)
       dlg->window.setText(lua_tostring(L, -1));
     lua_pop(L, 1);
 
+    type = lua_getfield(L, 1, "parent");
+    if (type != LUA_TNIL) {
+      if (auto parentDlg = may_get_obj<Dialog>(L, -1))
+        dlg->window.setParentDisplay(parentDlg->window.display());
+    }
+    lua_pop(L, 1);
+
     type = lua_getfield(L, 1, "onclose");
     if (type == LUA_TFUNCTION) {
       Dialog_connect_signal(
diff --git a/src/ui/manager.cpp b/src/ui/manager.cpp
index 8a0f56fe4..5dc48fd83 100644
--- a/src/ui/manager.cpp
+++ b/src/ui/manager.cpp
@@ -1318,7 +1318,9 @@ void Manager::_closingAppWithException()
 // Configures the window for begin the loop
 void Manager::_openWindow(Window* window, bool center)
 {
-  Display* parentDisplay = getForegroundDisplay();
+  Display* parentDisplay = (window->parentDisplay() ?
+                            window->parentDisplay():
+                            getForegroundDisplay());
   ASSERT(parentDisplay);
 
   // Opening other window in the "close app" state, ok, let's back to normal.
diff --git a/src/ui/window.cpp b/src/ui/window.cpp
index fe6ba862c..bd322db3a 100644
--- a/src/ui/window.cpp
+++ b/src/ui/window.cpp
@@ -1,5 +1,5 @@
 // Aseprite UI Library
-// Copyright (C) 2018-2022  Igara Studio S.A.
+// Copyright (C) 2018-2023  Igara Studio S.A.
 // Copyright (C) 2001-2017  David Capello
 //
 // This file is released under the terms of the MIT license.
@@ -335,8 +335,12 @@ void Window::centerWindow(Display* parentDisplay)
   if (m_isAutoRemap)
     remapWindow();
 
-  if (!parentDisplay)
-    parentDisplay = manager()->getDefault()->display();
+  if (!parentDisplay) {
+    if (m_parentDisplay)
+      parentDisplay = m_parentDisplay;
+    else
+      parentDisplay = manager()->getDefault()->display();
+  }
 
   ASSERT(parentDisplay);
 
diff --git a/src/ui/window.h b/src/ui/window.h
index ab926eb0d..80a1b1382 100644
--- a/src/ui/window.h
+++ b/src/ui/window.h
@@ -1,5 +1,5 @@
 // Aseprite UI Library
-// Copyright (C) 2019-2022  Igara Studio S.A.
+// Copyright (C) 2019-2023  Igara Studio S.A.
 // Copyright (C) 2001-2017  David Capello
 //
 // This file is released under the terms of the MIT license.
@@ -28,6 +28,12 @@ namespace ui {
     explicit Window(Type type, const std::string& text = "");
     ~Window();
 
+    // Preset parent display (instead of using the foreground/main
+    // window). Useful to display an alert/subdialog inside a specific
+    // window.
+    void setParentDisplay(Display* display) { m_parentDisplay = display; }
+    Display* parentDisplay() const { return m_parentDisplay; }
+
     bool ownDisplay() const { return m_ownDisplay; }
     Display* display() const;
     void setDisplay(Display* display, const bool own);
@@ -109,6 +115,7 @@ namespace ui {
     void limitSize(int* w, int* h);
     void moveWindow(const gfx::Rect& rect, bool use_blit);
 
+    Display* m_parentDisplay = nullptr;
     Display* m_display;
     Widget* m_closer;
     Label* m_titleLabel;