step 3: add widget shell sizing and frame pump

examples/sizing_child.py

@@ -0,0 +1,28 @@
+from typing import Any
+
+import dearpygui.dearpygui as _dpg
+
+import dpg_map as dpgm
+
+dpg: Any = _dpg
+
+
+def main() -> None:
+    dpg.create_context()
+    dpg.create_viewport(title="dpg-map child sizing", width=900, height=600)
+
+    with (
+        dpg.window(label="Nested Child", width=-1, height=-1),
+        dpg.child_window(width=-1, height=420),
+        dpgm.map_widget(tag="map-child", width=-1, height=-1),
+    ):
+        dpgm.add_marker("inside-child", lat=47.0, lon=2.0)
+
+    dpg.setup_dearpygui()
+    dpg.show_viewport()
+    dpg.start_dearpygui()
+    dpg.destroy_context()
+
+
+if __name__ == "__main__":
+    main()